From Shortage to Surplus

Weapons, Ammunition, and the Limits of Capacity in New Zealand, 1941–1944

One of the clearest ways to understand the scale of New Zealand’s 1939-1944 wartime transformation is not through unit establishments or organisational charts, but through the arithmetic of weapons and ammunition.

In 1941, the Army was small, lightly equipped, and operating within clear limits. By 1944, it had become something very different, a force holding thousands of weapons and millions of rounds of ammunition, supported by a nationwide network of depots and storage sites built at speed and under pressure.

At first glance, this appears to be a straightforward story of expansion. More guns, more ammunition, more infrastructure, a system growing to meet the demands of war.

But the detail tells a more complex story.

The Quartermaster-General’s report of 1944 provides a rare snapshot of that transformation. Using mid-1941 as a baseline and March 1944 as an endpoint, it shows not just what New Zealand held, but how rapidly it had to build the system to support it. Weapons were introduced faster than they could be standardised. Ammunition accumulated faster than it could be comfortably stored. Infrastructure expanded, but rarely kept pace.

Running through all of this was a constraint that was less visible but more decisive.

Not space.
Not supply.
Risk.

Even at the height of expansion, the system was not defined by how much it could hold, but by how safely it could manage what it contained.

Understanding Hazard: The Historical Foundations

The classification of ammunition by hazard category and group behaviour did not emerge fully formed during the Second World War. It was the product of decades of experience across the British and wider imperial ammunition system.

From the late nineteenth century onwards, a series of catastrophic explosions in magazines, depots, and aboard ships forced armies to confront a simple reality: ammunition did not merely burn, it behaved differently depending on its composition, confinement, and quantity. In some cases, a local incident could escalate rapidly through sympathetic detonation, producing catastrophic effects.

By the First World War, this understanding had become embedded in British ordnance practice.

From Experience to Principle

By the interwar period, British ammunition doctrine, which New Zealand inherited directly, had already established a set of hard-learned principles shaped by decades of accidents, battlefield experience, and industrial mishaps.

These included:

  • Separation of explosives by type, particularly detonators, propellants, and filled shells
  • Limitation of quantities per magazine, based not on space but on explosive effect
  • Dispersal of stocks, to prevent a single incident destroying an entire reserve
  • Recognition of sympathetic detonation, where one explosion could trigger another

Central to these principles was what would later be formalised as Net Explosive Content (NEC).

NEC represents the actual weight of explosive material, not the number of rounds. In practical terms, it provided a way to measure risk. A simple comparison illustrates this:

A single 3.7-inch anti-aircraft round contained a significant high explosive charge, meaning that thousands of such rounds could reach the safe explosive limit of a magazine. By contrast, millions of small arms rounds could be stored without approaching the same threshold.

This distinction mattered. Storage was not governed by how much could be stacked, but by how much explosive effect could be safely contained.

Although the term itself was not always used explicitly in this period, the concept was clearly understood. Magazine limits, spacing distances, and storage policies were already being determined by the total explosive effect that could be safely contained, rather than by available space.

Taken together, these principles map directly to what would later become:

  • Hazard categories (local versus mass explosion effects)
  • Compatibility groups (what can safely be stored together)
  • Net Explosive Content (NEC) limits (how much explosive risk can be safely held in one place)

The Emergence of Category and Group Thinking

By the 1940s, these ideas had been codified in practical terms. CAT X, Y, and Z were the standard hazard classifications used to categorise ammunition hazards:[1]

  • CAT X (local hazard)
  • CAT Y (intermediate hazard)
  • CAT Z (mass explosion hazard)

These categories reflected a long-standing recognition that:

  • Some ammunition would burn locally
  • Some would produce blast and fragmentation
  • Some could detonate in its entirety

Alongside this, British and Dominion forces employed a formal classification system set out in the Classified List of Government Explosives, which defined ammunition by composition, sensitivity, and function.[2]

Government Explosives Groups (Full Classification)

  • Group 1: Explosives bearing a fire and explosion risk, relatively sensitive to spark or friction, or requiring lead-free conditions, not containing a means of ignition.
  • Group 2: Explosives liable to decomposition, bearing an explosion risk and capable of functioning by spark or friction, but not containing a means of ignition.
  • Group 3: Explosives liable to decomposition, presenting primarily a fire risk, and not containing their own means of ignition.
  • Group 4: Stable explosives presenting a fire or explosion risk, but not containing their own means of ignition.
  • Group 5: Unboxed shell filled with high explosive, gunpowder, or similar compositions, plugged or fuzed.
  • Group 6: Boxed ammunition containing high explosive, gunpowder, or propellant, with or without its own means of ignition.
  • Group 7: Mines, bombs, and underwater ammunition filled with high explosive, plugged, with or without components.
  • Group 7A: Mines, bombs, and underwater ammunition filled with high explosive and containing their own means of ignition.
  • Group 8: Mortar and projector ammunition, grenades, and rockets, filled with high explosive or gunpowder, with or without propellant and components.
  • Group 9: Pyrotechnics, including signalling, illumination, and similar stores.
  • Group 10: Detonators and initiatory compositions, representing the most sensitive class of explosives.
  • Group 11: Incendiary and smoke ammunition not containing phosphides, white phosphorus, or flammable liquids.
  • Group 12: Ammunition containing phosphide or white phosphorus, presenting increased fire and chemical hazard.
  • Group 13: Chemical ammunition, including toxic or reactive fillings.
  • Group 14: Special group applicable to naval (H.M. ships) stowage conditions.
  • Group 15: Incendiary ammunition containing flammable liquids or gels, but not phosphorus.

This system defined what the explosive was. The CAT X/Y/Z system defined what it did in bulk.

From Composition to Behaviour

The interaction between these systems was central to wartime storage:

  • Group 5 and 7 natures typically aligned with CAT Z, driving magazine limits
  • Group 6 and 8 natures aligned with CAT Y, forming the bulk of operational stocks
  • Group 9 and some Group 11 natures aligned with CAT X, presenting mainly fire hazards
  • Group 10 detonators required strict segregation regardless of quantity

What emerges is a layered system:

A System Understood, but Defined by Limits

By the time of the Second World War, British and Dominion forces, including New Zealand, were operating within this framework in practice, even if the terminology had not yet been fully standardised.

What mattered was not the labels, but the underlying logic: Ammunition storage was governed not by how much space was available, but by how much explosive risk could be safely contained.

This distinction, already understood before the war, would become critical as New Zealand’s ammunition holdings expanded dramatically after 1942.

A Force Built on Scarcity

In mid-1941, New Zealand’s position was defined by limitation. Equipment existed, but in constrained quantities, and often of obsolescent types.[3]

At the end of 1941, New Zealand possessed just 164 artillery pieces of all classes.

Ammunition holdings reflected the same reality. Total gun ammunition stocks stood at 108,299 rounds, sufficient for training and limited contingencies, but not for sustained operations.

This was not a failure; it was a priority. New Zealand sat low in the imperial allocation system, and much of what it required existed on paper rather than in depots.

Yet even at this early stage, the nature of the ammunition held imposed constraints that were not immediately visible in the headline numbers.

Artillery Equipment and Ammunition Holdings, c. June–December 1941

TypeWeapon SystemQtyRounds HeldApprox Rds per Gun
FieldBL 60-pdr Mk I62,704451
FieldBL 6-inch 26-cwt How146,268448
FieldQF 4.5-inch Howitzer1914,074741
FieldQF 3.7-inch Howitzer92,589288
Field18-pdr QF Mk II6045,285755
Coast6-inch (Mk VII, XXI, XXIV)205,529276
CoastBL 6-inch Mk V (EOC)2310155
CoastBL 4-inch Mk VII144,531323
CoastQF 12-pdr Naval82,595324
Coast6-pdr Hotchkiss61,775296
AAQF 3-inch 20 cwt AA422,6395,660

At first glance, these figures reinforce the impression of scarcity, limited guns, modest ammunition stocks, and a force not yet configured for large-scale war. But read more closely, they reveal something more important.

The distribution of ammunition was uneven, and that unevenness mattered. Field artillery sat broadly within a band of 300 to 750 rounds per gun, reflecting a balance between capability and constraint. Coast artillery, while lower in rounds per gun, involved larger calibres and fixed locations, concentrating risk geographically. It is, however, the anti-aircraft line that stands apart with over 22,000 rounds held for just four guns. Taken together, these figures point to a subtle but important conclusion.

While the number of guns was small, the ammunition required to sustain them already imposed technical and safety constraints on the system. Storage was not simply a matter of space, but of how much explosive weight could be safely contained, how it was distributed, and how it could be managed.

In effect, even before the 1942 surge, the ammunition system was operating within the limits of explosive risk. This was not yet a crisis. But the conditions were already set, and the expansion that followed would not introduce complexity. It would multiply it.

The Shock of 1942: Demand Without Precedent

The entry of Japan into the war in December 1941 transformed the situation overnight.

Mobilisation surged. By mid-1942, New Zealand forces peaked at over 121,000 personnel, with roughly 200,000 troops in New Zealand when the Home Guard is included, all requiring equipment, weapons, and ammunition.[4]

The requirement was no longer incremental growth, it was exponential expansion, and the system responded.

Between July 1941 and March 1944, New Zealand received 2,507 artillery pieces. Modern field artillery supplemented rather than replaced obsolescent systems, resulting in a mixed and transitional inventory shaped as much by availability as by design.

At the outset in mid-1941, New Zealand’s field artillery reflected a largely First World War-era structure, including:

  • BL 60-pounder Mk I (6)
BL 60-pounder Mk I
  • BL 6-inch 26-cwt howitzer (14)
BL 6-inch 26-cwt howitzer
  • 18-pounder QF Mk II field guns (60)
18-pounder QF Mk I field guns
  • 3.7-inch howitzers (9)
3.7-inch howitzer
  • 4.5-inch howitzers (19)
4.5-inch howitzer

Between 1941 and 1944, new equipment was introduced in significant numbers, most notably:

  • Ordnance QF 25-pounder Mk II (255 received), which became the core field artillery system
  • 25-pounder (18/25-pdr conversions) (12)
  • 155mm M1917A1 guns (26 received, 12 retained)

At the same time, older systems were not immediately withdrawn. Instead, they were retained and, in some cases, augmented:

  • 18-pounders increased from 60 to 104
  • 6-inch 26-cwt howitzers increased from 14 to 18
  • 4.5-inch howitzers increased from 19 to 27

Additional equipment further complicated the inventory with Italian weapons captured in North Africa impressed into service for home defence:

  • Cannone da 77/28 Modello 05 (14 received, 10 held)
  • Cannone da 65/17 Modello 13 (17 received and retained)

Other systems, such as the 75mm pack howitzer (37 received), appear not to have been retained in New Zealand holdings, reflecting redistribution or operational allocation elsewhere.

This was not a clean transition from old to new. It was an accumulation driven by urgency, resulting in a heterogeneous mix of legacy, modern, and foreign-pattern equipment.

Alongside this, large numbers of anti-tank weapons were introduced, reflecting the growing importance of anti-armour defence across both home defence and expeditionary roles. This included the Ordnance QF 2-pounder and QF 6-pounder anti-tank guns, which formed the backbone of towed capability, supported by infantry-operated systems such as the Projector, Infantry, Anti-Tank (PIAT) and the Rifle, Anti-Tank, .55-inch Boys. These were further reinforced by a wide range of munitions, including rifle grenades and substantial stocks of anti-tank mines.

At the same time, there was a dramatic expansion in anti-aircraft capability, from just 4 guns in 1941 to 770 received within 12 months. This comprised a mix of heavy and light systems, including approximately 300 3.7-inch heavy anti-aircraft guns, forming the backbone of high-altitude defence, and around 470 40mm Bofors systems designed to counter low-level and fast-moving aircraft.

What makes this expansion particularly striking is not simply the increase in numbers, but the scale and diversity of the system that accompanied it. Anti-aircraft defence required not just guns, but:

  • Large quantities of high explosive, time-fuzed, and specialised ammunition
  • Fire control equipment, including predictors and, later, radar integration
  • Trained crews capable of sustained high-rate firing

Unlike field artillery, anti-aircraft weapons consumed ammunition at significantly higher rates. Even a single engagement could see a battery expend thousands of rounds. Scaled across hundreds of guns, this created an immediate and substantial demand on ammunition stocks, storage capacity, and distribution systems.

The increase from 4 to 770 guns was not simply numerical; it introduced one of the most ammunition-intensive and explosive-heavy systems within the New Zealand logistical structure.

By March 1944, holdings stood at 2,279 pieces of equipment, even after disposals and transfers. This was not simply growth. It was the rapid modernisation of an entire force.[5]

Ammunition: The True Weight of War

If weapons represent capability, ammunition represents sustainability.

From a baseline of 108,299 rounds, New Zealand received 4,614,189 rounds of artillery ammunition between July 1941 and March 1944. By March 1944, total artillery holdings had reached 4,722,488 rounds, spanning:

  • 28 calibres
  • 47 distinct types, including high explosive, armour-piercing, semi-armour piercing, smoke, chemical, and other specialised natures

This expansion was closely tied to the rapid growth in weapon systems, particularly anti-aircraft and anti-tank artillery.

The increase from just four anti-aircraft guns in 1941 to 770 within 12 months was matched by a corresponding surge in ammunition holdings. By March 1944, anti-aircraft ammunition alone had reached substantial levels, including:

  • 428,023 rounds of 3.7-inch heavy anti-aircraft ammunition
  • 608,984 rounds of 40 mm ammunition
  • 22,639 rounds of 3-inch 20-cwt ammunition
  • 26,400 rounds of 37 mm ammunition

Taken together, this represents more than 1 million rounds of anti-aircraft ammunition, a scale that far exceeded the holdings of many individual field artillery natures.

But anti-aircraft ammunition was only one part of the picture. New Zealand had also accumulated very substantial holdings of anti-tank ammunition. By March 1944, stocks included:

  • 650,997 rounds of Ordnance QF 6-pounder ammunition
  • 423,259 rounds of Ordnance QF 2-pounder ammunition
  • 791,043 rounds of 37 mm anti-tank ammunition

Together, these amounted to 1,865,299 rounds of dedicated anti-tank gun ammunition. This was a remarkable figure, reflecting the central place anti-tank defence had assumed in modern war. Unlike older artillery systems, anti-tank weapons were expected to be held ready for sudden, intense action, often at short notice and in dispersed positions. Their ammunition, therefore, imposed not merely a storage burden, but a readiness burden across the whole logistics system.

Tank-related ammunition added a further layer of scale. Armoured fighting vehicles and associated weapons drew upon large quantities of machine-gun ammunition, particularly for Besa 7.92 mm guns, of which holdings reached:

  • 215,500 rounds of Besa 7.92 mm Ball
  • 3,690,000 rounds of Besa 7.92 mm Ball and Tracer
  • 2,336,000 rounds of Besa 7.92 mm Ball, Tracer, and AP

This gave a combined total of 6,241,500 rounds of Besa ammunition alone. To this can be added 521,000 rounds of Boys .55-inch armour-piercing ammunition, showing that anti-armour defence still extended beyond gun systems into older infantry anti-tank weapons.

At the infantry level, anti-tank holdings were also substantial. Stocks included:

  • 58,000 Grenade No. 68 rifle-launched anti-tank grenades
  • 33,000 No. 74 Sticky Bombs
  • 98,000 No. 75 Hawkins anti-tank grenades
  • 6,700 PIAT HEAT bombs
  • Significant holdings of anti-tank mines, including 55,000 Mark II, 39,000 Mark V, 19,000 Local Pattern, and 7,200 M1A1 mines

These figures show that anti-tank capability was not confined to specialist guns. It was distributed across the force, from artillery and armoured units to infantry and field defences. In practical terms, this meant that anti-tank ammunition had to be stored, handled, moved, and issued across a much wider range of locations and unit types than many conventional artillery natures.

What makes this particularly significant is not just the quantity, but the nature of the ammunition itself. Anti-aircraft and anti-tank rounds were predominantly high-explosive, armour-piercing, or fused, designed for rapid, sustained fire under combat conditions. Much of this ammunition possessed what would now be recognised as high-hazard or mass-explosion characteristics. Unlike field artillery, where expenditure could be episodic, anti-aircraft and anti-tank systems were designed for immediate response to fast-moving threats. Even limited operational activity could consume large quantities of ammunition. Scaled across hundreds of guns, armoured vehicles, and infantry anti-tank weapons, this created an immediate and sustained demand on:

  • ammunition production and supply
  • storage capacity and magazine limits
  • handling, transport, and distribution systems

The expansion of anti-aircraft, tank, and anti-tank capability did not simply add to the total volume of ammunition. It introduced some of the most explosive-intensive, logistically demanding, and operationally sensitive natures within the entire system.

This helps explain why, despite the overall scale of artillery ammunition holdings, the distribution and behaviour of specific natures, particularly anti-aircraft, anti-tank, and other high explosive stocks, mattered far more than the total number of rounds.

This was not passive stock. New Zealand actively sustained operations, issuing over 839,000 rounds to Pacific forces. The scale is striking. But even this does not fully capture the weight of the system.

Beyond Artillery: The Full Ammunition Burden

Artillery ammunition formed only one part of a much larger inventory. By 1944, New Zealand was holding:

  • Hundreds of millions of rounds of small arms ammunition, including .303, .300, 7.92 9mm, and .45
  • Millions of mortar bombs and grenades, across multiple calibres and natures
  • Large stocks of anti-tank mines and infantry munitions
  • Substantial quantities of bulk explosives, including gelignite, ammonal, and monobel
  • Hundreds of thousands of detonators, fuzes, and explosive accessories

Taken together, this represented not just an increase in scale, but a transformation in the structure of the ammunition system.

Quantity Versus Risk

At first glance, the system appears dominated by sheer volume, particularly small arms ammunition, which alone ran into the hundreds of millions of rounds. Yet this volume was deceptive.

Small arms ammunition, despite its quantity, sat largely within what would now be understood as low-hazard categories, contributing relatively little to overall explosive risk.

By contrast, a much smaller proportion of holdings, particularly:

  • Artillery high-explosive ammunition
  • Anti-aircraft ammunition
  • Mortar bombs and grenades
  • Bulk explosives and demolition stores

carried significantly greater explosive weight and hazard.

These natures, which broadly align with mass-explosion characteristics, were the true drivers of risk within the system. What emerges is a clear distinction between:

  • The largest part of the system by quantity was small arms ammunition
  • The most significant part of the system by risk, high explosive and sensitive stores

In practical terms, this meant:

  • Storage capacity was not defined by how much could be physically held
  • It was defined by how much explosive hazard could be safely contained

A relatively small proportion of ammunition types effectively dictated the limits of the entire system, shaping:

  • Magazine design and spacing
  • Storage allocation
  • Handling and transport procedures

By 1944, New Zealand’s ammunition system had expanded to a scale that would have been unimaginable in 1941. Yet it remained constrained, not by shortage, but by the characteristics of the ammunition itself.

The true weight of war was not measured in the number of rounds held, but in the explosive risk carried by a small proportion of them.

Ammunition Infrastructure: Building a System to Carry the Weight

The rapid expansion in ammunition holdings between 1941 and 1944 did not occur in isolation. It drove a parallel transformation of New Zealand’s ammunition infrastructure, shifting it from a small, centralised network into a dispersed, nationwide system designed to manage both scale and risk.

Before the war, ammunition storage in New Zealand was limited in capacity and geographically concentrated. Facilities at Fort Balance, Ōhakea, and Hopuhopu reflected peacetime requirements, designed to store, inspect, and maintain relatively modest stocks. They were not intended to support a rapidly expanding force preparing for sustained operations at home and overseas.

From 1939, and particularly after 1941, this system came under immediate and sustained pressure. As new weapons and ammunition arrived in increasing quantities, existing magazine capacity was quickly exceeded. At the same time, responsibility for ammunition shifted toward a more specialised ordnance system, requiring a corresponding expansion in personnel, facilities, and technical oversight.

This pressure was not only physical. It was organisational.

A minute by the Quartermaster General, dated 12 October 1941, provides a clear snapshot of the ammunition organisation at the point when expansion was beginning to accelerate. At that time, the entire ammunition system was supported by a remarkably small workforce.[6]

Military personnel consisted of:

  • 1 Captain
  • 1 Lieutenant
  • 1 Staff Sergeant
  • 2 Corporals

These were supported by 12 civilian staff, comprising:

  • 10 civilians at Fort Ballance
  • 2 civilians at the Waikato magazines

In total, the national ammunition organisation was being sustained by just 17 personnel.

This was, in effect, a peacetime structure attempting to absorb a wartime influx. The system’s operational level remained heavily dependent on civilian labour, while military oversight was limited to a small supervisory cadre.

The implications were immediate. Ammunition was arriving in increasing quantities, magazine construction was expanding, and responsibilities were growing to include inspection, repair, preservation, accounting, and safe custody across multiple locations. Yet the manpower to manage this system remained minimal.

The response, as reflected in the same documentation, was an urgent move to expand and militarise the ammunition organisation. Civilian staff were to be replaced, and a dedicated military establishment was to be created to operate within camps, fortress areas, and dispersed magazine sites.

This moment marks a critical transition. By late 1941, the constraint on New Zealand’s ammunition system was no longer simply one of supply or storage. It was organisational. The system had reached the limits of what a small, peacetime manpower structure could sustain.

A Distributed National System

By the height of the war, New Zealand’s ammunition system had evolved into a layered structure:

  • Primary depots holding bulk reserves
  • Sub-depots and forward storage sites supporting regional forces
  • Inspection and repair facilities ensuring serviceability
  • Transport systems linking depots to operational units

This network extended across both islands. In the north, Ardmore, Hopuhopu, and Kelm’s Road formed key nodes. In the central districts, Waiouru and Makomako supported training and mobilisation. Around Wellington, Trentham and Belmont provided access to major ports. In the south, Glentunnel, Mount Somers, Fairlie, and Alexandra formed a dispersed magazine system supporting both storage and distribution.

Alongside Army facilities, RNZAF and naval ammunition depots were significantly expanded, developing into large, specialised sites with multiple magazines and dedicated handling infrastructure.

What emerged was not simply a collection of storage locations, but an integrated national system designed for distribution, dispersal, and continuity under pressure.

From Storage to Risk Management

This expansion marked a fundamental shift in approach. Pre-war ammunition storage had relied on centralisation, limited magazine numbers, and relatively small holdings. Wartime conditions made that model untenable.

In its place, a new system was implemented based on established ordnance principles:

  • Dispersal of stocks across multiple locations
  • Separation of hazardous natures
  • Increased spacing between magazines
  • Strict limits on explosive quantities per site

These measures were not new in theory, but the scale at which they were applied in New Zealand during the war was unprecedented. Storage was no longer simply about capacity; it was about controlling the effects of failure. Distance, separation, and containment became the primary tools for managing the risk of fire and sympathetic detonation.

Built Under Pressure, Proven Under Load

The expansion of ammunition infrastructure from 1941 onward was the result of a deliberate construction programme directed by Army Headquarters following War Cabinet approval. It reflected both the scale of wartime demand and a clear understanding that ammunition posed a distinct and enduring hazard.[7]

New magazine areas were established in locations selected for their ability to balance access with safety, often remote, dispersed, and deliberately concealed. Sites such as Ardmore, Waiouru, Makomako, Belmont, and Glentunnel were developed with these principles in mind.

Construction was carried out under persistent constraints. Difficult terrain, poor weather, and manpower shortages slowed progress, and in some cases ammunition stocks accumulated faster than permanent facilities could be completed, requiring temporary storage in the open. Despite these pressures, the underlying design principles were consistently applied:

  • magazines separated by distance
  • explosive quantities strictly controlled
  • traverses constructed to contain blast
  • depots dispersed to prevent catastrophic loss

This was not a system designed to eliminate risk, that was never possible. It was a system designed to manage it, absorb it, and prevent local incidents from becoming national disasters.

Its effectiveness would ultimately be demonstrated under operational conditions on 26 February 1945.

Glentunnel Ammunition Area 1943

At Glentunnel, one of the South Island magazine areas constructed as part of this expansion, an accidental explosion destroyed Storehouse No. 10 and its contents. The detonation was complete, reducing the building to debris.[8]

Yet despite the scale of the explosion, there were no casualties, and, more importantly, no propagation beyond the single magazine.[9] Adjacent storehouses remained intact, and no sympathetic detonation occurred.[10]

As later recorded in official accounts, this was the only storehouse lost to an accidental explosion during the period, and it demonstrated the effectiveness of traversing.

This outcome was not incidental. It was the direct result of the system described above.

Glentunnel Depot 1956, arrow indicating ESH 10

Magazines at Glentunnel had been excavated into the hillsides, arranged in sequence, and separated by earth traverses designed to absorb and deflect blast effects. The loss of one storehouse, while total at the local level, was contained at the system level.

Set against the wider wartime experience, where ammunition accidents could destroy entire depots, the distinction is clear. Where other systems failed through sympathetic detonation, Glentunnel did not.

What this demonstrates is fundamental. The constraint governing ammunition storage was not space, but risk.

The infrastructure built between 1941 and 1944 was not simply an expansion of capacity. It was a system engineered to ensure that when failure occurred, it remained localised.

Glentunnel provides a rare and definitive example that this system worked.

A System Built for Scale, But Constrained by Hazard

Despite the rapid expansion of infrastructure, capacity never fully aligned with demand.

The planning behind this expansion was itself a significant ordnance achievement. The allocation of space, calculation of permissible explosive limits, and matching of ammunition types to suitable storage were all undertaken without the benefit of modern ERP systems, digital inventory tools, or automated hazard-management software. Instead, this work fell to the small Inspecting Ordnance Officer staff, operating under the Chief Inspector of Munitions and Chief Inspecting Ordnance Officer, Lieutenant Colonel I. R. Withell. Their calculations relied on manual returns, local storage data, and technical information drawn from the latest Ammunition Bulletins issued by the Chief Inspector of Armaments in the United Kingdom and dispatched to New Zealand. In practical terms, the wartime ammunition storage system was built not only with concrete, timber, earthworks, and labour, but also through painstaking clerical discipline, technical judgement, and professional ordnance expertise.

By 1944, the manpower required to sustain this system reflected the scale of the transformation that had taken place since 1941.

As at 31 March 1944, the Ammunition Section and associated repair elements comprised an establishment of 159 personnel, with an actual strength of 150. The organisation was now distributed across Army Headquarters and the Northern, Central, and Southern Districts, with a dedicated Ammunition Repair Section responsible for inspection and maintenance.

In total, the system was supported by 10 officers and 140 other ranks.

This stood in stark contrast to October 1941, when the entire ammunition system had been sustained by just a handful of military personnel supported by civilian labour. What had emerged by 1944 was a fully militarised and professionalised organisation capable of managing both the scale and the risk inherent in modern warfare.

At the outset of the war, New Zealand possessed just 13-gun ammunition magazines, largely concentrated in a small number of established sites.[11] These were sufficient for pre-war holdings, but wholly inadequate for the scale of expansion that followed.

By March 1944, this had grown to:

  • 351 ammunition magazines distributed across the country
  • A total storage capacity of approximately 2¾ million cubic feet

This represents not just growth, but a transformation from a centralised, peacetime system into a dispersed, national network of ammunition storage and handling facilities.

Yet even this expansion did not resolve the underlying constraint.

As large volumes of ammunition, particularly high explosive and anti-aircraft stocks, entered the system:

  • Magazine capacity was limited by Net Explosive Content (NEC) thresholds, not physical space
  • High-risk natures required segregation, reducing usable capacity
  • Safety distances between magazines imposed hard limits on how much could be held at any one site

In practical terms, a depot could appear only partially full yet already be at its safe operating limit. At peak inflow, this tension was evident:

  • Ammunition was temporarily stored in the open and would remain a feature or many depots well into the post-war years
  • Stocks were frequently redistributed between sites
  • New magazine construction struggled to keep pace with arrivals

Even by the end of the war, the system remained under pressure. The return of ammunition from overseas, combined with retained reserves and the steady recovery of ammunition from disbanded and demobilising Home Defence units, quickly absorbed any remaining capacity.

The Quantitative Reality

The numbers tell the story clearly:

Yet the expansion in infrastructure did not translate into unlimited storage.

Because:

  • A relatively small proportion of ammunition, particularly CAT Z, Groups 5 and 7 high explosive natures, consumed a disproportionate share of allowable capacity
  • Lower-risk ammunition, such as small arms, occupied space but contributed little to the overall hazard

New Zealand built hundreds of magazines to store its wartime ammunition. In the end, it was not space that defined the system, but the limits imposed by explosive risk.

Lessons from Expansion

Looking back over the period from 1941 to 1944, what stands out is not just how much New Zealand built, but how the system actually behaved under pressure.

At the beginning, the problem appeared straightforward. There was not enough, not enough guns, not enough ammunition, not enough capacity. By 1944, that problem had been solved. New Zealand held more weapons, more ammunition, and more infrastructure than anyone in 1941 could reasonably have imagined. Yet the pressure never truly went away.

The reason lies in a constraint that was less visible, but more decisive. The system was never limited by how much it could hold. It was limited by explosive risk. More magazines could be built, depots expanded, and stocks redistributed, but the underlying characteristics of the ammunition could not be changed. That constraint remained constant, regardless of scale.

The expansion itself was not linear. New equipment arrived, but older systems were not immediately replaced. Instead, they remained in service, supplemented rather than withdrawn. The result was a heterogeneous force, combining First World War-era guns, modern British equipment, and whatever could be obtained under wartime conditions. The same pattern is evident in the ammunition, where diversity increased alongside volume.

On paper, the system appears enormous, particularly when small arms ammunition is included. Yet this volume is misleading. The majority of rounds sat within comparatively low-risk categories. The real constraint lay in a much smaller proportion of high-explosive and sensitive natures. These dictated how the entire system had to be organised, stored, and managed.

Before the war, ammunition could be held in a small number of centralised locations. By 1944, it had to be dispersed across the country. This was not simply a matter of efficiency or expansion. It was a matter of survivability. A failure at one site could not be allowed to compromise the entire reserve. Dispersion was therefore not optional, it was essential.

Even then, the system remained under constant pressure. Construction struggled to keep pace with inflow. Ammunition was stored in the open, stocks were redistributed between sites, and depots that appeared only partially full were already at their safe operating limits.

Use added a further layer of complexity. Some weapons remained largely static within the system. Others did not. Anti-aircraft weapons, in particular, transformed the problem. Their rate of expenditure turned stockpiles into flow systems, where sustainability depended not only on what was held, but on how quickly it could be replaced.

What is perhaps most revealing is that the pressure did not end with the war. As units demobilised and overseas stocks returned, the system was required to absorb them. What had once been a problem of shortage became a problem of accumulation. The infrastructure that had struggled to manage inflow now had to accommodate return and retention.

Seen in this light, the story is not one of shortage followed by surplus, but of balance.

New Zealand built a system capable of sustaining a modern force, supporting overseas operations, and managing vast quantities of ammunition. But it never escaped the limits imposed by the nature of what it held.

In the end, the system was not defined by how much it could store, but by how safely it could manage its contents.

Notes

[1] War Office, Ammunition Bulletin No. 4 (1939).

[2] Minisry of Transport, “Rules for the packing, stowage and labeling of explosives for carriage by sea,” Circular No 1895 (T152 recised) (1951).

[3] “Appendices to Report on QMG (Quartermaster-General’s) Branch,” Archives New Zealand Item No R25541151  (30 June 1944), .

[4] “Appendices to Report on QMG (Quartermaster-General’s) Branch.”

[5] “Appendices to Report on QMG (Quartermaster-General’s) Branch.”

[6] Deputy Quartermaster General 228/2/6 Ammunition Section _ NZ Army ordnance Corps Dated 13 Oct 1941 “Establishments – Ordnance corps “, Archives New Zealand No R22441743  (9 January 1937 – 1946).

[7] Major J.S Bolton, A History of the Royal New Zealand Army Ordnance Corps (Trentham: RNZAOC, 1992).

[8] “Explosion Heard Over Wide Area,” Greymouth Evening Star, 2 March 1945.

[9] “No Casualties Reported,” Waikato Times, 28 February 1945; “Ammunition Explosion at Glentunnel,” Evening Post, 28 February 1945.

[10] “Glentunnel Explosion Follow-up,” Evening Post, 13 April 1945; “Ammunition Store Destroyed,” Evening Post, 28 February 1945.

[11] “Establishments – Ordnance corps,” Archives New Zealand No R22441743  (1937-1968).


Anti-Aircraft Ammunition Disposal 1955-57

During the Second World War, New Zealand utilised approximately one hundred and thirty British Ordnance QF 3.7-inch Mk 3 Anti-Aircraft guns.[1]

Deployed across New Zealand at fixed and mobile sites with wartime scales of ammunition totalling 428,032 rounds, these guns stood ready during the war years in anticipation of Japanese air raids. New Zealand’s anti-aircraft defences were never tested, and with the immediate threat removed, the guns were placed into storage, and the ammunition was returned to depots for refurbishment. However, due to the considerable amount of ammunition returned to New Zealand’s depots at the war’s end, storage capacity was soon outstripped, necessitating the storage of large quantities under tarpaulins in field conditions.

Valentine Tank at Trentham, stacks of Ammunition can be seen in the background. NZ National Library Ref EP/1955/1794-F

By 1954, 17,000 rounds of 3.7-inch anti-aircraft ammunition had been stored in unsuitable conditions at the Liverpool Range outside Trentham Camp. With sufficient 3.7-inch stocks available to meet training needs in other depots, the Liverpool Range stocks were considered surplus. Although initially intended for inspection and refurbishment at the Kuku Valley Ammunition Repair Depot, inspections revealed that the Liverpool Range stocks had deteriorated to the point where destruction was the only option.

Examination of a deteriorated shell at Trentham, Upper Hutt. National Library of New Zealand Ref: EP/1955/1792-F

A plan was formulated to transport the 17,000 rounds of unstable 3.7-inch ammunition from its storage area at the Liverpool Range across the valley, approximately 1.4 kilometres, to the demolition area at Seddon Range. The explosive content was destroyed there, and recoverable components, such as the brass casings, were collected and sold as scrap.

The Royal New Zealand Engineers constructed a road between the Liverpool and Seddon ranges to create a safe working area around the stacks and provide access to them.

Due to the detonation risk of the ammunition and its storage containers and the likelihood of an explosion, a modified armoured truck and trailer were constructed to facilitate the transportation.

Army vehicles at Trentham, Upper Hutt. Ref: EP/1955/1793-F. Alexander Turnbull Library, Wellington, New Zealand. /records/23078184
Demolitions – 3.7 AA Kuku Valley Trentham – RNZAOC Ammunition Collection

The 3.7-inch round was a 12.7kg single piece of ammunition consisting of a cast steel projectile with a tapered nose filled with Amatol, TNT, or RDX/TNT explosives, mounted in a brass casing. The brass casing contained an explosive primer and a cordite propellant charge that could propel the projectile to a maximum ceiling of 9,000 meters or a horizontal range of 15,000 meters. Each 3.7-inch round was packed in a fibre cylinder, with two rounds packed into a C235 steel case.[2]

Examples of 3.7-inch rounds
C235 Ammunition Tin (2 x 3.7-inch rounds per tin)
Demolitions – 3.7 AA Kuku Valley Trentham 2 – RNZAOC Ammunition Collection

With 17,000 rounds in 8,500 cases, ten cases (twenty rounds) were transported from the Liverpool Range to the demolition area at a time. The cases were then unloaded at the demolition range, and in batches of four, the rounds were detonated.

From June 1955, five or six detonations occurred daily, with the frequency and strength of the explosions causing some distress to residents, with the Upper Hutt Council questioning the Army on the reasons for the explosions.[3] Another resident forwarded a strongly worded protest letter to the editor of the Upper Hutt Leader Newspaper.[4]

Letters to the Editor

Dear Sir, The terrific explosions at the Trentham Camp which have wrecked our nerves for some considerable time, are the subject of this letter. Mr Editor. The world is at peace, yet we are at war (by the sound of things) in this beautiful valley in which we live. Every day these loud blasts shake our houses, waken our babies end sleeping little ones also elderly people having an afternoon nap, have a rude awakening, It takes very little imagination to realise the effect this bombing has on the nerves of bed-ridden patients at the Silverstream hospital. I ask you to publish this letter in the hope that the authorities will cease-fire, or at least explain why and how long this blasting is to be endured.

I am etc.,

ATOMIC BOMB

However, the explosive destruction of the old ammunition continued, and the daily explosions became an accepted and routine feature of life in Upper Hutt.[5]

The demolition of the 17000 rounds of unsafe 3.7inch ammunition was concluded in December 1957. The destruction had proceeded without incident, with the local residents thanked for their considerable forbearance in putting up with the noise of explosions nearly every day.

Demolitions – 3.7 AA brass 1956 – Sgt Bob Handy Kuku Valley Trentham 5. RNZAOC Collection

Notes

[1] Damien Fenton, A False Sense of Security: The Force Structure of the New Zealand Army 1946-1978, Occasional Paper / Centre for Strategic Studies: New Zealand: No. 1 (Centre for Strategic Studies: New Zealand, Victoria University of Wellington, 1998), Bibliographies, Non-fiction.

[2] Great Britain. War Office, Anti-Aircraft Ammunition: User Handbook (War Office, 1949).

[3] “The “Boom” from Trentham Camp,” Upper Hutt Leader, Volume XII, Number 28, , 28 July 1955.

[4] “Letters to the Editor,” Upper Hutt Leader, Volume XII, Number 29, , 4 August 1955.

[5] Howard Weddell, Trentham Camp and Upper Hutt’s Untold Military History (Howard Weddell, 2018), Bibliographies, Non-fiction, 187-88.


The Hunter Brothers

nz-army-ordnance-corps-badge-2
NZ Army Ordnance Corps Badge 1917-1937. nzhistory.govt.nz/Public Domain

The Hunter Brothers’ service was unassuming, and when looked at as part of the broader history of the New Zealand Ordnance Corps, their service was uneventful. The only significant event of their service is that they are one of the few sets of brothers to be awarded the Meritorious Service Medal. What their service does provide is a snapshot of the activities of the New Zealand Army Ordnance Corps in the 1920s

The children of Irish Immigrants who were farming a small property near the Marlborough town of Tuamarina, John was born on the 13th of August 1880 and Thomas on the 20th of December 1881.

John and Thomas joined what was then the New Zealand Permeant Militia, spending considerable time as Gunners in the Artillery before transferring to the New Zealand Army Ordnance Corps soon after its formation in 1917. John’s time in Ordnance was spent in the Ammunition Section based out of Fort Balance on the Northern Miramar peninsular in Wellington. Thomas ordnance Service was at the Ordnance Store at Mount Eden and the then brand-new Waikato Camp (Hopuhopu/Ngawahawia Camp).

Both brothers served for more than 30 years and, under normal circumstances, retired at 55 with a comfortable pension, but this was not to be. Due to the worldwide depression and economic recession, the Government was forced to savagely reduce the strength of the Army by using the provisions of section 39 of the Finance Act, 1930 (No. 2), where military staff could be either;

  • Transferred to the Civil service, or
  • Retire on superannuation any member of the Permanent Force or the Permanent Staff under the Defence Act, 1909, or of the clerical staff of the Defence Department whose age or length of service was such that if five years was added thereto, they would have been enabled as of right or with the consent of the Minister of Defence to have given notice to retire voluntarily.

Using this act, on the 31st of March 1931, the NZAOC lost;

  • Six officers and Thirty-Eight Other Ranks were retired on superannuation
  • Seventy-four NZAOC staff (excluding officers and artificers) who were not eligible for retirement were transferred to the civilian staff to work in the same positions but at a lower pay rate.
Hunter retirement letter
Notice of Retirement sent to Serving soldiers in December 1930

For the soldiers placed on superannuation, the transition was brutal, with pensions recalculated at much lower rates and, in some cases, the loss of outstanding annual and accumulated leave. The 31st of March 1931 was the blackest day in the History of the New Zealand Army Ordnance Corps

John Francis Hunter

John Hunter attended the local school until Standard 5 and then spent a year at St Patricks College at Silverstream in Wellington. On leaving school, John Hunter took up a farming job in Bulls.  At Eighteen years of age, John enlisted at Alexandra Barrack in Wellington into the New Zealand Permanent Force (NZPF) and was attested as a 3rd Class Gunner into No 1 Company in Wellington on the 23 of November 1898. John Hunter Passed the Small Arms Drill Course on the 6th of January 1899, followed by the Recruits Drill Course on the 1st of May and was promoted to 2nd Class Gunner on the 1st of September 1899.

alexandra-barracksC
Alexandra Barracks, Mount Cook Wellington (Colourised). Credit: Alexander Turnbull Library.

With the reorganisation of the NZPF in 1902, the small permanent artillery force was designated the Royal New Zealand Artillery (RNZA), with John Hunter remaining with the Wellington Detachment. While serving as the “Servant to the General Officer Commanding,” John Hunter unsuccessfully applied for a transfer to the New Zealand Police in 1902. John Hunter was to spend a short period detached to Lyttleton on Police duty during the New Zealand International Exhibition held in Christchurch in 1906/07. John Hunter was promoted to 1st Class Gunner on the 1st of September 1907. With the reorganisations of 1907 and 1911, John Hunter remained in the Gunnery Section of the RNZA Wellington Detachment working in the various Wellington Coast Defence Forts.

Marrying Edith Taylor in Fielding on the 28th of January 1911, John Hunter was still based in Wellington when the Great War was declared in 1914, but at 34 years old, was then considered too old for war service.

Since 1911 there had been concerns in Army Headquarters about the supply of Artillery ammunition and the associated costs of importing all of the required stocks to maintain training and operational needs. Studies had found that by refurbishing by cleaning, inspecting and refilling cartridge casings, and inspecting and refurbishing in-service propellant bags and manufacturing new ones as required, considerable savings could be made instead of importing new items. Recommendations were made that as part of the RNZA, a specialist Ordnance Stores Corps be established to manufacture and modify Ammunition. Ordnance Stores Corps was under the supervision of the Master Gunner and entitled to the same pay and allowances as other members of the RNZA, as they were just another section of the RNZA.

Although envisaged in 1911, the formation of this Ordnance Stores Corps had an extended gestation period, and it was not until mid-1914 that General Godley, the Commander of the New Zealand Forces, approved the proposal and work could begin in establishing the Artillery Ordnance Stores Corps. Orders were placed on Great Britain for the required machinery, components and most importantly, cordite, with some of the machinery received in good time, the remainder was promised to be delivered as soon as possible by the British suppliers. Given that war had broken out, setting up this capability and securing New Zealand’s immediate supply of Artillery was of the utmost importance.

The new Corps was to be another uniformed section of the RNZA, such as the Field Artillery or Electric Light Company. It was to be under the administration and control of the OC RNZA and not the Quartermaster General, and on 1 March 1915, authority was granted under New Zealand Defence Forces General Order 90 to raise the New Zealand Army Ordnance Section with effect 1 April 1915.  Located at Fort Ballance at Mahanga Bay on Wellington’s Miramar Peninsula, the section’s primary duties were assembling ammunition components for the artillery, with care and upkeep of the magazines becoming part of their responsibilities. John Hunter Transferred into the RNZA Army Ordnance Section on the 1st of July 1915.

fort-ballanceC
Fort Ballance (including associated positions at Fort Gordon) (Colourised). Alexander Turnbull Library, Wellington, New Zealand,

With the Formation of the New Zealand Army Ordnance Corps (NZAOC) on the 1st of February 1917, the RNZA retained operational day-to-day control of the Ammunition Section, with the NZAOC taking up administrative control of its personnel. The personnel of the Ammunition Section, including Gunner John Hunter, transferred into the NZAOC on the 15th of March 1917. On the 8th of February 1917, John Hunter was awarded the New Zealand Long Service and Good Conduct Medal.

RMS Niagara
RMS Niagara

December 1917 saw John Hunter’s experience as a gunner called upon when he was seconded to the NZEF as an Acting Corporal. Embarking on the RMS Niagara on the 13th of February 1918 as Corporal Gunner of the Gun Crew. Returning to New Zealand in September 1918 and replaced by Naval gunners, John Hunter spent a short time with the RNZA in Featherston Camp before re-joining the NZAOC in February 1919. Interestingly the RMS Niagara on which John Hunter served and disembarked in September 1918 is the vessel attributed by some sources as the source of the 1918 influenza pandemic that had a devastating effect on New Zealand.

Returning to his duties at the Ammunition Section at Fort Ballance, John Hunter was the newest member of the Ammunition Section and was identified as the only suitable understudy for the then NCO In-Charge Sergeant J Murray and was promoted to Lance Corporal on 1 November 1919. 1921 saw John Hunter awarded; the New Zealand Efficient Service Medal, and the Meritorious Service Medal and was also issued with his war service medals; the British War Service 1914-1918 Medal and the Victory 1914-1919 Medal.

Promoted to Temporary Corporal on the 1st of January 1921, John Hunter was made the NCO I/C at the Ammunition Laboratory at Shelly Bay. By August 1921, on the retirement of Sergeant Murray, Hunter was promoted to Corporal and appointed as IC of the Ammunition Section.

The immediate post-war years into the mid-1920s were a busy time for the NZAOC Ammunition Section. The Kaiwharawhara Powder Magazines close to the city were closed. The Mahanga Bay facilities expanded from the original magazine and laboratory building on the foreshore to include Fort Balance, Fort Gordon and the Kau Point Battery as their guns were decommissioned. With armaments removed, gun pits covered over with roofs and turned into additional magazines, the once impressive forts went from being Wellington’s premier defensive location to quite possibly the first large-scale ammunition depot of the NZAOC, a role held until 1929 when purpose-built facilities were constructed at Hopuhopu Camp in the Waikato.

He was promoted to Sergeant on the 1st of July 1922, further promotions followed on the 1st of June 1926 when he was promoted to Staff Sergeant and then again on the 1st of June 1929 when promotion to Staff Quarter Master Sergeant (Warrant officer Class 2) was gained.

After spending most of his 32-year career on the Miramar Peninsular of Wellington. Warrant Officer Class Two John Hunter was discharged from the Army on the 31st of March 1931 at the age of 52 under the provisions section 39 of the Finance Act, 1930 (No. 2) where members of the military were forced to retire under superannuation at a much lower rate than they should have usually been entitled too. WO2 John Hunter also lost;

·         21 days approved annual leave

·         22 days accrued leave

John Hunter’s forced retirement in 1931 might not have been his final Military service. Census and voter lists from 1935 to 1954 list his occupation as Solder, with the Census and voter from 1957 as retired. Further examination of service records is required, but an assumption is that given his ammunition experience, he was re-engaged in a lesser rank and continued in the military during the war years into the mid-1950s.

Records show that John and his wife Edith had no children and remained at the same address at 57 Kauri Street Miramar until his death on the 23rd of March 1967 at the age of 87 and is buried at Karori Cemetery, Wellington

 Thomas Alexander Hunter

Completing school at Standard 4, Thomas entered the workforce and worked as a Grocers Assistant at Foxton before enlisting into the NZPF. At 18, Thomas attested into the NZPF on the 2nd of August 1900. Thomas completed the Recruit Drill and Arms Cours at Alexandra Barrack in Wellington and was posted to the Artillery as a Pre-Gunner for his probation period. On completion of probation on the 1st of February 1901, Thomas was posted to the No 1 Company in Wellington.

With the reorganisation of the NZPF in 1902, the small permanent artillery force was designated the Royal New Zealand Artillery (RNZA), with Thomas Hunter remaining with the Wellington Detachment. With the reorganisation of 1907, Thomas continued working in the Gunnery Section of the RNZA Wellington Detachment in the various Wellington Coast Defence Forts.

On the 10th of May 1908, Thomas married Maude Taylor at Newmarket in Auckland and was posted to the RNZA Auckland detachment on the 16th of November 1908. Thomas’s first child Edward was born on the 15th of February 1909. Further Children followed with the Birth of Bernard on 20 February 1910, Bambara on 28 March 1911 and Veronica on 21 November 13

Thomas was transferred into the Field Artillery Section on the 1st of August 1911 and back into the Gunnery Section on the 1st of May 1912. When the war was declared in 1914, Thomas was 33 years old and considered too old for war service. Thomas was stuck with tragedy in September 1915 when his daughter Bambara died due to illness.

Like his brother, Thomas was seconded to the NZEF in February 1918 as an Acting Corporal. Embarking on the SS Makura as gun crew. Returning to regular duty in June 1918, when the Army gunners were replaced by Naval gunners.

New Zealand Long and Efficient Service Medal
New Zealand Long and Efficient Service Medal, 1887-1917, New Zealand, by George White. Gift of Mr Dollimore, 1956. CC BY-NC-ND 4.0. Te Papa (NU006152)

Awarded the Permanent Forces of the Empire Beyond the Seas Medal in December 1918, with the formal presentation on the 1st of February 1919. Thomas was promoted to temporary Bombardier on the 1st of February 1920, attaining Full Bombardier rank on the 1st of February 1921. Further recognition of his service followed with the award of the Meritorious Service Medal on the 21st of November 1921 and the New Zealand Long and Efficient Service Medal on the 6th of February 1922. Thomas was also presented with British War Service 1914-1918 medal and the Victory 1914-1919 Medal.

With many of the Coastal Defenses nearing the end of their usefulness, (Fort Victoria, where Thomas had one stage been attached to, had only ever fired one proofing round and was promptly taken out of action because of complaints from its neighbours who had suffered many broken windows) resulted in the decommissioning of many of the older batteries. As Thomas was then the senior Bombardier in the Auckland region, instead of being forcibly made redundant, he was transferred to the NZAOC and posted to the Ordnance Store at Mount Eden on the 31st of July 1922. Living at Devonport at the time, the move to the new position at Mount Eden worried Thomas. As Mount Eden was then a Suburb on the far side of Auckland, the travel costs were a concern to Thomas. The strain on his family was also a concern, his children were beset with ill health, with one child passing away due to illness in 1915 and another with infantile paralysis. To make matters worse, Thomas was forced to reduce rank to Lance Corporal on the 1st of August 1922.

Auckland Gun
Disappearing Gun, North Head Auckland. Robert McKie Collection

The early 1920s were a busy time for the Mount Eden Ordnance Store. After the First World War, the New Zealand Territorial Army undertook a major re-equipment project with two Infantry Divisions and one Mounted Brigade’s worth of equipment arriving from the United Kingdom. Initially stored at Trentham and Featherston Camp, with a purpose-built Ordnance Store to service the Northern region under construction at Ngawahawia, storage space was at a premium. With Featherston Camp closing down, the Mount Eden Ordnance Store had to receive, sort and distribute much of the equipment for the Northern Region units well over its storage capacity, as well as providing support to the territorial Army Annual Camps.

By 1928 The development of Ngaruawahia Camp was now in its final stages, with the large Ordnance Store building completed and the stores from the Ordnance Depot at Mount Eden progressively being transferred to it. Two high-explosive magazines were completed, with an additional three high-explosive magazines and a laboratory, and the provision of mains and equipment for fire prevention nearing completion. With the removal of stores to Ngaruawahia Camp, the buildings at Mount Eden were no longer required, so they were disassembled and re-erected at Narrow Neck Camp.

Thomas was promoted to Temporary Corporal on the 1st of February 1926, followed by promotion to Sergeant on the 1st of March 1928. Up to June 1929, Thomas was the NOC IC Camp Equipment, but with the Ordnance Depot now at Ngawahawia, Thomas was transferred onto the Small Arms Proof Office staff, allowing him to remain at Mount Eden.

After spending the majority of his 30-year 141-day career in Auckland, Sergeant Thomas Hunter was discharged from the Army on the 31st of March 1931 at the age of 49 under the provisions section 39 of the Finance Act, 1930 (No. 2), where serving members of the military were forced to retire under superannuation at a much lower rate than normally entitled too. Sergeant Thomas Hunter was fortunate that before the notification of the redundancy on the 17th of December 1930, he had already applied for and had approved the use of his annual and accrued leave.

Moving on from a life in the military, Thomas settled at 88 Sandringham Road and took up the trade of confectioner. Thomas passed away at 84 years of age on 5 October 1965.

Copyright © Robert McKie 2018


Ammunition Technician Origins

From the formation of the New Zealand Ordnance Corps in the early years of the First World War, the Corps has been the primary agency for supplying and maintaining weapons, munitions and other military equipment. An essential commodity requiring specialised skills, munitions were the responsibility of the Ammunition Technician Trade group. The requirement for the safe storage, inspection and distribution of munitions has existed in New Zealand from the earliest years. It was not until the 1890s, with the manufacture of advanced Small Arms Ammunition types in New Zealand, that a specialist was employed to conduct the proof testing and oversee small arms ammunition production. This article will examine the initial manufacture of Small Arms Ammunition in New Zealand and the specialist who laid the foundations for the modern Ammunition Technician Trade.

For many years in early Colonial New Zealand, ammunition and explosives were imported from the United Kingdom and Australia. Powder magazines were established in the main centres, and Magazine keepers were appointed. Any specialist expertise required for the handling and storing these stocks was provided by qualified and experienced individuals from the British Military Stores Department (Until 1870) and Royal Artillery and Engineer officers attached to the New Zealand Forces, who provided expertise on an as-required basis.

In 1885 the Russians repositioned elements of their naval fleet into the North Pacific, establishing a naval base at Vladivostok, creating for British Imperial possessions the “Russian Scare” of 1885. It was thought that Tsar Alexander had ambitions to expand his empire. Feeling vulnerable at the edge of the British Empire, the New Zealand Government embarked on a programme of fortification construction. It urgently sought independent sources of supply for ammunition to become independent of the need to rely upon Britain. With the government’s encouragement, Major John Whitney established Whitney & Sons as an ammunition manufacturing company in Auckland. With additional investors, this company became the Colonial Ammunition Company (CAC) in 1888, the first ammunition manufacturer in New Zealand and Australasia. Entering a contract with the New Zealand Government to produce small arms ammunition, the deal was that the government provided the powder with the CAC providing the components for manufacturing complete cartridges. The Government retained the right to inspect and conduct quality control inspections on each batch before acceptance by the New Zealand Forces. The testing regime was a simple one which consisted of testing only a small percentage of a batch by test firing. The test results were based on the performance of this percentage that the ammunition is accepted or rejected.

reduced_1_W01057_mm
Colonial Ammunition Company works on the lower slopes of Mount Eden in Normanby Road, Mount Eden, 1902.
Sir George Grey Special Collections, Auckland Libraries, 1-W1057.

With the production of .577 Snyder Ball Ammunition underway by 1890, the first testing, inspection and acceptance of the initial batches were conducted by Major John Pirie of the New Zealand Militia. Formerly a Major in the Guernsey Militia, Major Pirie immigrated to New Zealand, becoming the Auckland District Musketry Instructor in 1881. Conducting inspections of manufactured ammunition until July 1891. From July 1891, ammunition inspection was passed to the Officer Commanding the Auckland District, Major Goring. In 1893, Lieutenant J E Hume of the Permanent Militia was responsible for examining ammunition. Hume continued to hold this responsibility in addition to his other duties until 1898.

By 1896 the New Zealand colony was mainly equipped with the .450 calibre Martini-Henry series of rifles and carbines. Ammunition was still provided under contract with the Colonial Ammunition Company but with additional stocks produced by the Kynoch ammunition company in the United Kingdom. The conditions of the original contract with CAC remained extant, with the Government responsible for providing the powder and the CAC the components. As this system had been in place for some time, it was recognised that this division of responsibility was flawed. There had been many incidents of ammunition failure, but due to this procurement division, it was often difficult to attribute fault to any specific party. It was recommended by the Defence Department to Parliament that the CAC should be responsible for the entire end-to-end process for the manufacture of complete cartridges and that the Government retained the right to examine and test all components (powder, caps and cases) and complete cartridge cases. Testing was to be conducted by an official with the required training and experience for such work. No such individual existed in the colony at the time, so one needed to be recruited.

Ballistic Chronograph
Ballistic Chronograph

During 1896/97, units from all over New Zealand continued to complain about the quality of the ammunition supplied to the Defence Force by CAC. Although CAC was contracted to be the sole supply source of small arms ammunition, powder and components were still provided from the United Kingdom. The powder passed the same tests as powder supplied for manufacturing UK-manufactured ammunition. CAC continued to argue that the powder was not good and attributed the failures of the ammunition chiefly to that cause. Lacking the expertise to test the powder in New Zealand, five hundred rounds from each batch manufactured in 1896 were sent to the United Kingdom for proof and examination by Government experts. The proofing process attributed that the failure of the ammunition was not due to the powder but to irregularities in manufacture. With few facilities then available in New Zealand for the correct proofing of the specification of finished ammunition, testing equipment, including velocity instruments such as Ballistic chronographs, were ordered from the United Kingdom. As there was no individual in the Colonial Forces who possessed sufficient knowledge to set up and operate these instruments, it fell onto the Chief of the Defence Force to, as far as possible, personally supervise and set up the testing apparatus providing the necessary instruction until a suitably qualified individual could be recruited from the United Kingdom.

The CAC refused to accept the return of suspect stocks as they argued that, as per the current contract, it had passed the required tests and been approved by the Government, ending their responsibility. The ammunition in store was to be used up and replaced by a competent and serviceable supply. It was accepted that the testing officers had done their testing conscientiously and that the percentage of rounds tested had been under the terms of the specification. But as the colony’s very existence might one day be at stake, every step needed to be taken to ensure a supply of reliable ammunition. As the Government was bound by contract to obtain their supply of small-arms ammunition from CAC, the following recommendations were made.

  • CAC should supply their own powder and all component parts,
  • Production of the current “rolled case” pattern of ammunition was to be ceased as this type had ceased to be used by other Imperial forces, and by switching production to the more reliable “solid drawn” would bring New Zealand Forces into line with the rest of the Imperial Forces.
MH BALL
Plate illustrating the Rifle Ball Mark III construction from “Treatise on Ammunition 1887”.

On the 67th of February 1898, a formal request was forwarded to the United Kingdom for the recruitment of a suitable Warrant Officer from the Royal Artillery to “Take charge of the testing operations of Small Arms Ammunition and the supervision of the manufacture of the same”.

On 6 April 1898, Quartermaster Sergeant Instructor Arthur Duvall, Royal Garrison Artillery of the Artillery College, was selected and took up the offer to be the Small Arms Testing officer for the New Zealand Forces. To be promoted to 3rd Class Master Gunner on a three-year engagement at a rate of Nine Shillings a day with free quarters or a £50 per annum housing allowance. Duvall arrived in New Zealand in July 1898 and was soon at work at the CAC premises at Mount Eden in Auckland.

Under the administrative command of the Officer Commanding No 1 Company Permanent Militia, Auckland Duvall was immediately put to work. With the introduction of the .303 Martini Enfield rifles in 1898, CAC started production of the Mark II C and Mark IV .303 rounds. Providing a level of expertise never available before, Duvall held the CAC to account and provided the Defence Force with a reliable product.

Coming under the command of the New Zealand Permanent Militia Headquarters in 1903, Duvall had his engagement with the New Zealand Forces extended by an additional three years in 1903 and then another three years in 1907. Duvall oversaw the introduction of the .303 Mark IV round in 1904.

CAC MAchinery
Machinery for the production of Military ammunition, CAC Factory Auckland 1903
c224c5d0-4982-4457-ad42-58a7a7ef4ffa
Bullet-making machinery at the Colonial Ammunition Company’s works, Mt Eden. Auckland War Memorial Museum, DU436.1243 C718.

Completing Twenty years of service with the British Army in 1911, Duvall took his discharge and was immediately attested into the New Permanent Staff as an Honorary Lieutenant on 26 April 1912 and then promoted to Honorary Capitan on 1 April 1914.

Honorary Captain Duvall oversaw the manufacture and testing of Small Arms Ammunition in Auckland, ensuring New Zealand was self-sufficient in the supply of Small Arms Ammunition. Moves were underway at Fort Ballance in Wellington to provide New Zealand with some self-reliance with artillery ammunition with the formation of the New Zealand Army Ordnance Section of the Royal New Zealand Artillery in 1915. The RNZA Ordnance Section was responsible for the refurbishment by cleaning, inspecting and refilling QF Casings, inspecting and refurbishing service propellant bags, and manufacturing new ones as required, resulting in considerable savings made instead of importing new stock.

On 10 January 1918, Duvall was transferred from the Permanent Staff to the New Zealand Army Ordnance Department, graded as an Ordnance Officer Class 3 with the rank of Captain. His appointment as Testing Officer Small Arms Ammunition was renamed as Proof Officer, Small Arms Ammunition, as part of the Ordnance Corps Technical branch.

On the 4th of July 1919, Duvall arrived at the premises of the CAC at about 930 am. After speaking to a member of his staff Mr B.E Lambert, Duvall then retired to the laboratory. At approximately 1040am, Duval was found in the laboratory, deceased, lying on his face with a service rifle across his body. In the Coroner’s report published on 16 July 1919, the coroner found that the cause of death was a gunshot wound, self-inflicted, while in a state of nervous depression]. Duvall was interred with military honours at Purewa cemetery on 5 July 1919.

Despite the sudden death of Duvall, The Small Arms and Proof Office remained an essential component of the New Zealand Army ammunition supply chain until 1968, when the Colonial Ammunition Company shifted its operations to Australia, and the Army ended its long relationship with the Colonial Ammunition Company.

Administrative control of the New Zealand Army Ordnance Section of the Royal New Zealand Artillery was passed to the New Zealand Army Ordnance Corps upon its formation if 1917. Technical control of Artillery ammunition remained with the RNZA until 1946 when responsibility for all ammunition was handed over to the Inspection Ordnance Officers Branch of the NZAOC. The Inspecting Ordnance Officers Branch, which had only consisted of a few staff officers during the interwar period, rapidly expanded during the Second World War with Ammunition Depots established at Ngaruawahia, Waiouru, Makomako, Kuku Valley, Belmont, Mount Sommers, Alexandra, Glen Tunnel (Hororata) and Fairlie. The ordnance Ammunition trades consisted of.

  • Inspecting Ordnance Officers (Officers) and
  • Ammunition Examiners (Other ranks).

These roles remained extant until 1961 when the following changes were made following UK practice.

  • Chief Inspecting Ordnance Officer became Chief Ammunition Technical Officer.
  • Senior Inspecting Ordnance Officer became Senior Ammunition Technical Officer.
  • District Inspecting Ordnance Officer became District Ammunition Technical Officer.
  • Inspecting Ordnance Officer became Ammunition Technical Officer.
  • Ammunition Examiner became Ammunition Technician.

Over the next thirty years, the ammunition trades matured into a highly specialised trade that, on the amalgamation of the RNZAOC into the RNZALR in 1996, had a wide range of responsibilities, including:

  • The inspection, storage and maintenance of all ammunition and explosives used by the Army.
  • The conduct of technical trials on new ammunition.
  • The conduct investigations into ammunition incidents and accidents.
  • The disposal of unserviceable or obsolete ammunition.
  • The management of Explosive Ordnance Devices and Improvised Explosive Devices.

By 1996 the Ammunition trade had progressed from rudimentary black powder magazines in the 19th century to the management of many modern ammunition natures. Although many individuals had been involved in the handling and storage of ammunition up to the appointment of Arther Duvall in 1898, Duvall stands out as the first individual specially trained and employed solely in the field of ammunition management and, as such, deserves recognition as the founding member of what became the Ammunition Technician Trade.

Copyright © Robert McKie 2017

 

Bibliography

Primary Sources

Archives New Zealand/Te Rua Mahara o Te Kawanatanga Wellington Office
Military Personnel Files D.1/420/1 Arthur Duvall – Captain, New Zealand Army Ordnance Corps

New Zealand Gazette
Testing-Officer for Small-arms Ammunition appointed. New Zealand Gazette No 17 Page 412 28 February 1895

Appendices to the Journals of the House of Representatives (AJHR)
1896 H-19 Report on the Defence Forces of New Zealand
1897 H-19 Report on the Defence Forces of New Zealand
1898 H-19 Report on the Defence Forces of New Zealand

Auckland Star
“THE LABORATORY FATALITY,” Auckland Star, p. 4, 5 July 1919.
“CORONER’S INQUEST,” Auckland Star, vol. L, no. 168, 16 July 1919.

Secondary Sources

IPENZ, “Engineering Heritage of New Zealand,” IPENZ Engineers New Zealand, 11 December 2017. [Online]. Available: http://www.ipenz.org.nz/heritage/itemdetail.cfm?itemid=2228. [Accessed 12 December 2017].
J. Osborne and P. Cregeen, “Martini Enfield Rifle MK I, I,” New Zealand Arms Register, 21 October 2010. [Online]. Available: http://www.armsregister.com/arms_register/arms_register_documents/nzar_63_martini_enfield_mki.pdf. [Accessed 13 December 2017].
J. Osborne and P. Cregeen, “Martini Enfield Rifle MK I, I,” New Zealand Arms Register, 21 October 2010. [Online]. Available: http://www.armsregister.com/arms_register/arms_register_documents/nzar_63_martini_enfield_mki.pdf. [Accessed 13 December 2017].
Osborne, “Chronology of the British & New Zealand Military .303″ Cartridge,” 7 March 2012. [Online]. Available: http://www.armsregister.com/arms_register/arms_register_documents/nzar_250_british_nz_303_cartridge.pdf. [Accessed 13 December 2017].