New Zealand Army Ammunition Technical Investigation from Shelly Bay to the Ammunition Technician Trade

Training with ammunition has always carried risk. Whether on a rifle range, during grenade training, in artillery practice, during demolition work, or while handling explosives in a depot or field environment, ammunition must function as designed, and soldiers must use it as directed. When either of those things goes wrong, the consequences can be serious and, in the worst cases, fatal.

For the New Zealand Army, the investigation of ammunition-related incidents is one of the important roles performed by Ammunition Technical Officers and Ammunition Technicians. Their purpose is not to assign blame. It is to conduct a technical appraisal of the ammunition, explosives, weapons, stores, and procedures involved, and to determine, as far as the evidence allows, what happened and why.

That distinction matters.

This is a historical and institutional narrative, not a technical investigation report. It draws on inquest records, commission findings and newspaper accounts to trace how the investigative function evolved. It does not attempt to reconstruct failure mechanisms to modern forensic standards, and readers with an Ammunition Technical trade background should read the technical detail in each case as illustrative of the investigative principle at work, not as a substitute for the original findings.

In the aftermath of an ammunition incident, particularly one involving injury or death, there is a natural desire to find an immediate cause. Was the ammunition faulty? Did the weapon fail? Did the operator make a mistake? Was supervision inadequate? Was the drill wrong? These are necessary questions, but they must be answered carefully. The role of the ammunition specialist is to establish the technical facts before drawing conclusions.

A sound ammunition investigation seeks to determine whether the ammunition was serviceable, whether it was being used within its design limitations, whether storage or handling may have affected its condition, whether a batch or lot may require restriction, and whether procedures, training, or equipment need to be amended. It is an evidence-based process, not an exercise in blame.

This article follows two connected stories. The first is the history of selected incidents involving the New Zealand Army and New Zealand military ammunition. The second is the evolution of the specialist technical structure needed to investigate them. Before New Zealand had Ammunition Technical Officers and Ammunition Technicians, accident investigation relied on commissions, coroners, artillery officers, submarine mining specialists, Defence Department officials, police and expert witnesses. Over time, those ad hoc arrangements gave way to formal inspection, proof (test-firing to confirm a batch is safe to use), surveillance (ongoing monitoring of the condition of stored ammunition), and technical control of ammunition.

Where the names of those killed are known, they are included. This is not to sensationalise the incidents, but to ensure that the technical lessons are anchored in the lives of the people who were lost. Ammunition accidents are often discussed in terms of natures (in ammunition terminology, a “nature” is a specific type or mark of munition, tracked separately from other types), batches or lots (ammunition manufactured together and tracked as a group, so a defect found in one can be traced to the rest), fuzes (mechanical or electronic devices that initiate a munition, as distinct from a burning safety fuse), guns, drills and procedures. Those details matter, but they should not obscure the human cost that gave urgency to each investigation.

Before the Ammunition Trade

The early New Zealand ammunition and explosives accidents of the 1890s and early 1900s occurred before the Army had a dedicated technical ammunition trade. These incidents were not investigated by Ammunition Technical Officers or Ammunition Technicians in the modern sense, because that professional structure did not yet exist.

Instead, investigations were conducted through the mechanisms then available: formal commissions, coroners’ inquests, police representation, Defence Department oversight, and the evidence of officers and men with practical experience in artillery, submarine mining, torpedo work, engineering and explosives.

This does not mean that the investigations lacked technical content. On the contrary, the evidence from Shelly Bay, Mahanga Bay and Fort Ballance shows that the inquiries were often highly technical. They examined explosive preparation, initiation, storage, testing, drill, gun mechanisms, breech closure, cartridge case behaviour, detonators, guncotton sensitivity, and the transmission of regulations. What was missing was not technical curiosity, but a permanent New Zealand military organisation whose standing function was to own ammunition inspection, investigation, records, testing and technical assurance.

The significance of the 1891, 1899 and 1904 inquiries is therefore not that they were conducted by ammunition specialists. They were not. Their significance lies in showing why ammunition specialists became necessary.

Shelly Bay, 1891: A Technical Inquiry Before a Technical Trade

On 5 March 1891, a guncotton explosion (guncotton being a nitrocellulose-based high explosive then used in mines and demolition charges) occurred at Shelly Bay during submarine mining work, killing Torpedomen William Densem, aged 22, and William Horrocks Heighton, known as William Ross, aged 35. Torpedoman Cornwall was also seriously injured in the blast.[1]  The subsequent inquiry was conducted by two Royal Navy officers, appointed by the Governor through the Admiral commanding the Australian Squadron, who acted as Royal Commissioners tasked with determining the cause of the explosion.[2] The Commissioners found that the accident was caused by the overheating of a loaded primer tin (a sealed container holding percussion primers — small explosive charges used to initiate a larger charge) while its lid was being soldered on. Their report reconstructed the sequence of events in technical detail, identifying the location of the primer tins, the use and reheating of the soldering iron, the presence of dry guncotton, and the way heated gases and flame caused successive detonations.[3]

The Commissioners did not simply ask who was at fault. They examined the process, the workplace, the explosive stores, the instructions in force, and whether War Office memoranda had been properly circulated. Their findings were direct. They stated that solder should not be applied to cases containing guncotton, whether wet or dry, and that live charges fitted with detonators should not be stored in the mine store. They also observed that cases containing guncotton were not properly covered, that periodical testing had not been consistently recorded, and that there was a need for a “permanent responsible head” who could account for torpedo stores and other warlike material in the colony.[4]

That recommendation is especially important. Decades before New Zealand developed the Ammunition Technical Officer and Ammunition Technician structure, the Shelly Bay inquiry had identified the need for centralised technical responsibility for explosives, testing, records, and regulatory compliance.

The Commission’s report also demonstrates the value of investigation beyond blame. Captain Falconer, the officer responsible for the submarine mining operations at Shelly Bay, had his practice criticised, but the report also acknowledged his experience and familiarity with submarine mining.[5] The issue was not simply one man’s conduct. It was the wider system: how instructions were issued, how stores were controlled, how testing was recorded, and how dangerous processes were supervised.

In that sense, Shelly Bay stands as an early example of technical investigation into ammunition before there was an ammunition technical branch.

The following year’s Defence report confirms that two separate inquiries ran in parallel: the naval Royal Commission and a distinct civil court process, with the findings of both forwarded to the Government.[6] That dual-track approach, with military and civil investigations running side by side, is itself an early precursor to the layered, multi-source technical investigation later formalised under the Ammunition Technical Officer structure.

Mahanga Bay, 1899: When Experience Was Not Enough

On 7 August 1899, a fatal guncotton explosion occurred at Mahanga Bay during the demolition of an old electric searchlight pedestal at Point Gordon. The inquest into the deaths of Sergeant Octavius Olive, aged 38, Corporal Henry Blick, aged 53, and Sapper William Teague, aged 25, was opened at Mahanga Bay.[7] A fourth man, Sapper John James Head, was also injured in the explosion. Inspector Pender represented the police, Commissioner Tunbridge, Colonel Penton, Commandant of the New Zealand Defence Forces, and other military officers were present, and legal representatives appeared for the relatives of Corporal Blick and Sergeant Olive.[8]

Captain Falconer gave evidence that he had ordered the destruction of the old pedestal and that a guncotton mine had prematurely exploded while the work was being carried out. Sergeant Olive was tamping (packing the explosive firmly into place) the guncotton into a hole in the concrete, Blick was holding the box containing broken guncotton, and Teague was taking guncotton from the box and placing it into the hole. The main wires were reportedly not connected, and the detonators were later found intact, suggesting that the charge had not been fired electrically.[9]

The evidence was technically complex. Captain Falconer stated that he had no theory to explain the explosion and that similar methods had been used many times before without mishap. Torpedo Gunner Broderick of HMS Mildura, who had experience with naval explosives, examined the guncotton and found it satisfactory. Witnesses considered whether the explosion could have been caused by ignition, confinement, friction, percussion, a spark, faulty guncotton, or heating from the sun. Colonel Penton, while unable at that stage to attribute blame, stated that after the accident he would issue instructions that guncotton should be used in a damp state wherever available.[10]

The coronial inquest ultimately absolved the officer in charge of blame. The case was also referred to the Home Office in London for an independent scientific opinion, which upheld the jury’s finding. Following the accident, Penton ordered that all future demolitions be carried out only under “service” conditions and with “service” stores.[11] That sequence- inquest, independent expert review, and a resulting change to procedure- is the technical investigation cycle the modern Ammunition Technical Officer trade was later built to carry out as a matter of course.

Mahanga Bay is valuable because it shows the limits of experience and routine practice. Those involved were trained, experienced, and working according to methods they believed were accepted. Yet an unexplained premature explosion still occurred. The lesson for ammunition specialists is clear: repeated safe use does not prove that a practice is safe in all conditions. Technical investigation must consider not only whether the people were competent, but whether the explosive system, environment, method of preparation, and method of initiation provided adequate safety margins.

Mahanga Bay also reinforces a theme that runs through the history of ammunition incidents: when the technical cause is uncertain, the investigation must resist the temptation to settle too quickly on blame. Colonel Penton’s evidence, that he could not attribute blame at that stage, is precisely the approach later embodied in formal ammunition technical investigation.

Fort Ballance, 1904: Weapon, Ammunition and Drill

On 2 November 1904, Gunner John Amos Palmer of the Royal New Zealand Artillery was killed during firing practice at Fort Ballance when the breech-block of a 12-pounder quick-firer blew out. Several other members of the detachment were injured. The adjourned inquest was resumed at the hospital, with Inspector Ellison appearing for the police, Mr Levi for Palmer’s widow, and Mr Myers watching the case for the Defence Department.[12]

The inquest evidence concentrated on the weapon mechanism, the breech, the firing drill, the cartridge case, gas escape, heating, the number of rounds fired, and whether the gun could have fired unless the breech was properly closed. Members of the gun detachment repeatedly stated that the gun appeared to be in proper order, that the breech was properly closed, and that the correct firing drill had been followed. Bombardier Petersen, Gunner Slines, Gunner Sweeney and Gunner O’Neill each gave evidence from within the gun detachment.[13]

This was not an ammunition-branch technical inquiry. It was a coronial inquiry that relied heavily on practical artillery evidence. In a breech-loading gun of this kind, the cartridge case, expanding under firing pressure, seals the rear of the barrel; if that seal fails, hot gas can escape backwards toward the gun crew, which is why the questions below focus so heavily on the case and the breech. Yet the questions it asked were recognisably ammunition-technical questions. Did the cartridge case expand correctly to seal the breech? Was gas able to escape to the rear? Did electric or percussion firing have any bearing? Was the breech properly closed? Could drill or mechanism have allowed a dangerous condition to develop?

A later report on the inquest into the suicide of Gunner John Hay in 1906 is relevant to the theme of blame. Hay had apparently believed that others blamed him for Palmer’s death, but witnesses stated that they had not heard such blame and that Palmer’s death had been purely accidental.[14]That sad aftermath reinforces why technical investigation must be careful, evidence-based and clearly communicated. When the causes of an ammunition or weapon accident are uncertain, rumour and blame can fill the gap. That is why establishing what happened is only half the task; the other half is preventing unsupported assumptions from hardening into accepted truth.

From Magazine Keepers to Ammunition Technical Specialists

The early inquiries at Shelly Bay, Mahanga Bay, and Fort Ballance show why New Zealand eventually needed a dedicated technical ammunition function. In the nineteenth century, responsibility for ammunition and explosives sat largely with those who managed powder magazines, artillery stores, submarine mining stores and Defence Stores Department holdings.

Ammunition and explosives were imported from Britain and Australia, with powder magazines established at Mount Cook in Wellington and Mount Albert in Auckland. Responsibility for handling and storing these stocks sat with qualified individuals from the British Military Stores Department, Royal Artillery and Royal Engineers. After the withdrawal of Imperial forces in 1870, responsibility for New Zealand’s magazines and ammunition transferred to the Defence Stores Department, with later facilities established at Mount Eden in Auckland and Kaiwharawhara in Wellington.[15]

This early system provided practical control of magazines and ammunition, but it was not yet a specialist ammunition technical branch in the modern sense. When something went wrong, expertise had to be assembled from artillery officers, submarine mining personnel, naval torpedo specialists, police, coroners, commissions and Defence Department representatives.

By the late nineteenth century, New Zealand had also developed local ammunition manufacture. Major John Whitney’s ammunition interests evolved into the Colonial Ammunition Company in 1888, which produced small-arms ammunition for the New Zealand Government. Under the government contract, the state supplied powder while the company manufactured the cartridges. Each batch then underwent government inspection and testing before acceptance.[16]

That inspection process is significant. It shows that the principles later associated with ammunition technical work, inspection, proof, surveillance, testing and acceptance were already present before the formal trade structure existed. However, they were dispersed across different responsibilities rather than held by a single dedicated ammunition technical organisation.

The First World War and its aftermath accelerated the need for specialist technical control. The organisational titles below changed more than once over the following decades, but the underlying job, technical control of ammunition, stayed essentially the same throughout; readers mainly need the end point, that the modern Ammunition Technical Officer and Ammunition Technician titles arrived in 1961. Administrative control of the New Zealand Army Ordnance Section of the Royal New Zealand Artillery passed to the New Zealand Army Ordnance Corps (NZAOC) on its formation in 1917. Concurrently, technical control of ammunition passed to the Inspection Ordnance Officer of the NZAOC.

During the interwar period, the Inspecting Ordnance Officers Branch consisted of only a small number of staff officers. These included Major William Ivory, RNZA, who served from 2 January 1921 to 6 April 1933, and Captain I. R. Withell, B.Sc., RNZA, who served from 1933. The branch expanded rapidly during the Second World War as ammunition depots were established at locations including Ngaruawahia, Waiouru, Makomako, Kuku Valley, Belmont, Mount Somers, Alexandra, Glentunnel and Fairlie.  Post-war, the ordnance ammunition trades comprised Inspecting Ordnance Officers and Ammunition Examiners.

In 1961, following United Kingdom practice, the titles changed. The Chief Inspecting Ordnance Officer became the Chief Ammunition Technical Officer; the Senior Inspecting Ordnance Officer became the Senior Ammunition Technical Officer; District Inspecting Ordnance Officers became District Ammunition Technical Officers; Inspecting Ordnance Officers became Ammunition Technical Officers; and Ammunition Examiners became Ammunition Technicians.

The modern Ammunition Technical Officer and Ammunition Technician structure, therefore, did not appear out of nowhere. It grew out of decades of experience in magazine management, ordnance inspection and proof, ammunition manufacture, explosive accidents, unexploded ordnance, and the need for independent technical advice. The Flaming “A” badge, adopted in 1971, symbolises the hazardous and highly skilled trade, but the professional roots of the role reach much further back to the early colonial handling of powder, guncotton, shells, and small-arms ammunition.

The 1932 Marton bus bombing also illustrates the development of the technical role beyond conventional ammunition.[17] Long before modern Explosive Ordnance Disposal existed as a military speciality, the Inspecting Ordnance Officer was called upon to examine a suspicious explosive device and later give expert evidence in court. The case has been described as a proto-EOD moment because it shows the State turning to a recognised military explosives authority to identify, reconstruct, control and report on an improvised explosive incident.[18]

Brocton Camp, 1918: When the Ammunition Works as Designed

Not every ammunition accident is caused by faulty ammunition.

On 19 April 1918, Lieutenant Randolph Gordon Ridling, New Zealand Rifle Brigade, was instructing reinforcement troops in the use of the Mills bomb at Brocton Camp, Staffordshire. A nervous trainee fumbled a live grenade after removing the pin, panicked, and dived into the corner of the bombing bay. Ridling pulled the man to shelter and was wounded when the grenade exploded. He was later awarded the Albert Medal for his actions.[19]

Public accounts of the incident point to panic and drill breakdown rather than a munition defect. That is exactly why the case is instructive. Even where an initial account suggests operator error, an ammunition technical investigation must still exclude ammunition failure.

Was the grenade correctly issued? Was it serviceable? Was the fuze operating within expected timing? Was the correct type of grenade being used for the training activity? Did the layout of the throwing bay allow an error to become fatal? Were the instructor and trainee positioned so that a failed throw or hesitation could be managed safely?

The ammunition may have functioned exactly as designed, but the incident still required technical understanding. Ammunition investigation is not limited to proving that a round, grenade, shell or fuze failed. It also helps establish when the ammunition did not fail, and when the true lesson lies in training design, supervision, safety margins or drills.

Trentham, 1942: Variability, Realism and Fatal Consequence

The best New Zealand example of the complexity of ammunition investigation is the grenade fatality at Trentham Military Camp on 7 February 1942.

During grenade instruction at the Army School of Instruction, an “emergency grenade” prematurely detonated. The incident resulted in the deaths of Major Richard James Dunlop Davis, New Zealand Staff Corps; Sergeant Robert Andrew Peters; Acting-Sergeant Roland Stephens Thomson; Corporal Richard Mark Geard; and Acting-Sergeant Herbert Henry Wood. Davis, Peters, Thomson and Geard died on 7 February. Wood died of his injuries on 8 February.[20]

The grenade was not a standard factory-produced munition. It was an expedient design based on components of the Mills grenade, adapted for local manufacture. Instead of an integrated, mechanically controlled fuze system, it used a short length of commercial safety fuse, approximately 3 inches long.

The training sequence followed accepted practice at the time. After trainees threw live grenades, the instructor assembled and demonstrated the emergency grenade in front of the class. The fuse was ignited and began to burn. Witnesses observed irregular behaviour, with the fuse appearing to falter or extinguish momentarily. The instructor intervened, flicking the fuse, after which it resumed burning from a lower point. Seconds later, the grenade detonated while still in his hand.

The technical evidence, as reported at the time, did not point neatly to a single simple cause. Lieutenant Colonel I. R. Withell, Chief Inspector of Munitions, gave evidence that the design was not considered inherently unsafe. The nominal burn time was approximately seven seconds, inspection procedures were in place, and instructors were trained to check components before use. Post-incident testing suggested that even damaged or kinked fuses generally burned within expected tolerances.

Yet the system still failed.

The danger lay not necessarily in a single defective item, but in the interaction of several factors: a short, manually prepared length of commercial fuse, variability in fuse burn behaviour, a close-proximity demonstration, and human intervention after ignition. Each factor could be understood in isolation. Together, they eliminated the margin for error.

Cases like this are why technical investigation of ammunition is essential. The question is not simply, “Who made a mistake?” It is, “What combination of design, material, preparation, drill, environment and human intervention allowed a fatal outcome?”

The Trentham case also demonstrates the danger of judging earlier practice only by modern standards. During the Second World War, training placed a premium on realism. Soldiers were expected to handle live munitions and to understand their weight, timing and effect. Modern simulation systems and high-fidelity inert training aids did not exist. In that environment, live and expedient training systems could be considered necessary and reasonable.

The lesson, however, was clear. Realism without adequate control can become unacceptable risk. Modern explosive ordnance training seeks to eliminate unnecessary variability, separate training from explosive hazard wherever possible, use inert or simulated systems when appropriate, and ensure that live ammunition is used only under tightly controlled conditions.

Wartime Unexploded Ammunition: Foxton, Hastings and Napier

Ammunition danger does not end when a range practice or training activity finishes. In January 1945, public warnings were issued after serious accidents involving old ammunition, including a fatal accident to one child and injuries to others at Foxton, and a serious accident to a schoolboy at Napier. The Minister of Defence warned the public, particularly children, not to handle shells, bombs or ammunition of any kind, and to notify the police or nearest army authority instead.[21]

A related Hastings report identified the shell involved in an accident as a six-pounder manufactured in 1902. Although it was described as a “dud”, an Army official pointed out that the projectile still contained a charge and could not be treated as harmless simply because it was old or had apparently failed to function when fired.[22]

These reports are important because they show another side of ammunition technical work: public safety and the management of unexploded ordnance. The Minister noted that live ammunition was being found in former live-firing areas, bombing ranges, sea beaches and other locations. He also acknowledged that, despite stringent regulations and post-practice searches, some unexploded projectiles could remain unrecovered, especially in sandy country.

For Ammunition Technical Officers and Ammunition Technicians, such incidents underscore the enduring principle that ammunition must be treated as dangerous until it has been technically assessed. Age, corrosion, previous handling, or apparent failure do not make ammunition safe. A shell, bomb, grenade or cartridge may remain hazardous long after its original military use has been forgotten.

Waiouru, 1959: Freezing a Nature Pending Technical Findings

On 14 February 1959, two Territorial gunners, Gary Winston Churchill and Brian Roland Haskell, were killed during exercises at Waiouru when a shell apparently exploded in the breech of a 25-pounder gun. Three others were injured. The New Zealand Army withdrew that type of 25-pounder ammunition from use and kept it “frozen” pending receipt of the court of inquiry’s accident report from the United Kingdom, from where the ammunition had been supplied.[23]

The Army’s response shows ammunition control in action at its strongest. It did not simply treat the event as an isolated gun accident. It restricted the ammunition nature pending technical investigation. That decision reflects the core logic of ammunition safety: when there is a possibility of a technical defect, similar ammunition must be controlled until the risk is understood.

The 1959 Waiouru accident sits naturally beside the later FH-2000 accident of 1997. Both involved artillery ammunition, both required technical investigation, and both raised the possibility that the incident was connected to ammunition or fuze performance rather than solely to operator action. Together they show why ammunition investigations must look beyond the individual round and ask whether a wider batch, lot, nature or supply source may be affected.

Waiouru, 1974: The Human Factor in Grenade Training

On 13 February 1974, Sergeant Murray Ken Hudson, Royal New Zealand Infantry Regiment, was killed during grenade training at Waiouru Military Camp. Hudson was supervising a training exercise when Sergeant G. Ferguson accidentally armed a grenade and froze. Hudson ordered him to throw it, then attempted to force the throw by grasping Ferguson’s hand. The grenade exploded, killing both men. Hudson was posthumously awarded the George Cross.[24]

As with Brocton in 1918, the public record points to operator failure and drill breakdown rather than an ammunition defect. But again, this does not remove the need for technical investigation.

In any such incident, an ammunition specialist would still need to confirm the nature of the grenade, its serviceability, the condition and function of the fuze, the timing sequence, and whether any batch- or storage-related concerns existed. Only once those technical questions were answered could the Army properly conclude that the ammunition functioned as designed and that the lesson lay in training, procedure, supervision or range layout.

This distinction is important. A soldier’s hesitation or error may be the visible event, but the purpose of investigation is to identify the system conditions that allowed that error to become fatal. Was the training layout adequate? Was there enough physical separation? Were instructor intervention drills realistic? Were the commands clear? Were safety arcs, pits, bays and emergency actions designed to preserve life once a grenade was armed?

Establishing what failed is not the end of the job. The specialist also helps commanders understand whether the ammunition, the weapon system, the training design and the human factors combined safely, or whether the system relied too heavily on perfect human performance.

Waiouru, 1982: Blind Ammunition and the Continuing Hazard

On 26 June 1982, Army Regular Force cadet Bryce Gawler, aged seventeen, of Rotorua, was killed at a Waiouru training area in an accident involving “blind”, or unexploded, ammunition. Two other cadets were injured: Philip Koziel, aged seventeen, of Nuhaka, near Wairoa, seriously; and Paul Clarkin, aged seventeen, of Hamilton. The injured cadets were taken to Taumarunui Hospital, and the Army convened a court of inquiry to investigate the accident.[25]

This incident connects the wartime warnings about unexploded ammunition in 1945 to the modern training environment. Even on an established military training area, unexploded ammunition remains a serious hazard. The issue is not only whether ammunition functions correctly when fired, but what happens when it fails to function and remains in the field.

Blind ammunition creates a delayed risk. It may be encountered by later users of the range, by soldiers conducting unrelated training, or by personnel who do not recognise the item or understand its condition. The technical questions are therefore broader than the immediate accident: what nature of ammunition was involved, why had it failed to function, how had it remained undetected, what range clearance procedures were in place, and what controls were needed to prevent recurrence?

For ammunition specialists, the 1982 Waiouru incident reinforces the importance of range clearance, reporting of blinds, explosive ordnance recognition, and the principle that unexploded ammunition must be left to qualified personnel.

Waiouru, 1997: Faulty Fuze, Batch Risk and Technical Control

The 9 March 1997 FH-2000 artillery accident at Waiouru provides a modern example of the technical investigation function.

During a live-firing exercise conducted by the 23rd Battalion, Singapore Artillery, at Waiouru Army Camp, a 155 mm artillery round exploded in the barrel of an FH-2000-gun howitzer. Two Singaporean servicemen, Third Sergeant Ronnie Tan Han Chong and Lance Corporal Low Yin Tit, were killed. A further twelve servicemen were injured, including a New Zealand Defence Force staff sergeant who was present as a liaison officer and observer.

A Committee of Inquiry convened by Singapore’s Ministry of Defence found that the most probable cause of the accident was a defective fuze fitted to the 155 mm projectile, according to the published findings; this account does not go further into the specific fault mode than that Committee’s public report does. The defective fuze resulted in the premature explosion of the round. Following the incident, the lot of fuzes from which the defective fuze had come was X-rayed, with approximately 1.3 per cent found to be defective.[26]

The case shows clearly why ammunition technical investigation extends beyond the immediate accident scene. Once a faulty fuze was identified as the likely cause, the question became much wider than the damaged gun and the casualties. Were other fuzes from the same lot unsafe? Had the defect been introduced during manufacture? Was the fault visible through inspection? Had acceptance testing, supplier assurance or sub-contractor control failed? Should the lot be withdrawn, screened, restricted or destroyed?

The technical response had to connect the failed component, the batch, the weapon system and the method of loading. That is the heart of ammunition technical work. It is not enough to know that an explosion occurred. The specialist must determine whether the same conditions exist elsewhere in the stockpile and whether other personnel could be exposed to the same risk.

The Investigative Role of the Ammunition Specialist

Across these incidents, the recurring theme is not blame but understanding.

Ammunition Technical Officers and Ammunition Technicians bring a particular form of expertise to post-incident investigation. They understand ammunition design, fuzing systems, explosives, propellants, packaging, surveillance, storage, deterioration, compatibility, handling and disposal. They are trained to look at the technical system as a whole.

In a post-incident setting, their work may include:

• preserving technical evidence before it is disturbed;
• identifying the ammunition nature, lot, batch and condition;
• examining fragments, fuzes, cartridge cases, propellant, packaging and weapons;
• determining whether the ammunition functioned as designed;
• assessing whether storage, transport, age, environmental exposure or handling may have affected performance;
• considering whether similar ammunition should be quarantined, restricted, inspected, tested or withdrawn;
• advising commanders on whether training may continue and under what controls; and
• recommending changes to drills, range procedures, supervision, equipment or technical instructions.

In some cases, the finding may be that the ammunition failed. In others, the ammunition may have functioned correctly, and the cause may lie in procedure, handling, supervision or human performance. Frequently, the answer is a combination of factors.

That is why premature blame is dangerous. If investigators assume the operator was at fault, a defective batch may remain in service. If they assume the ammunition was defective, a dangerous training practice may continue unchanged. The technical investigation must remain open to both possibilities until the evidence is understood.

Inspection Before Incident

Technical ammunition work is also preventative.

Inspections can identify deterioration, incorrect packaging, damaged stores, environmental effects, suspect lots, or unsafe conditions before an incident occurs. Ammunition surveillance and technical inspection allow commanders to make informed decisions about what may be issued, what must be restricted, and what should be destroyed.

The 1959 Waiouru and 1997 FH-2000 accidents both show this principle in practice, the first at the level of a single ammunition nature, the second at the level of a fuze batch. In each case, the investigation did not stop with the failed item; it asked whether the same defect existed elsewhere in the stockpile.

The Trentham case shows a different but equally important lesson. Even if individual components appear to function within tolerances, the design of the training system may still be unsafe if it contains uncontrolled variability and depends on human intervention after initiation. Technical safety is not only about whether a component passes inspection. It is also about whether the complete system provides enough margin for error.

From Accident to Doctrine

The development of modern ammunition practice has been shaped by incidents such as these. Every serious occurrence forces the Army to:

• Ask whether existing procedures are sufficient.
• The lessons are consistent.
• Live ammunition must be used only where the training value justifies the risk.
• Realism must be subordinate to control.
• Systems should not rely on human correction after initiation.
• Training design must assume that people may hesitate, misread, freeze or make mistakes.
• Unexploded ammunition must be treated as dangerous until technically assessed.
• Ammunition defects must be investigated at the batch and stockpile levels, not only at the incident level.
• Technical findings must be translated into practical changes.

These principles are now embedded in modern ammunition and explosive ordnance practice. They are the result of experience, investigation and institutional learning.

Conclusion

Ammunition incidents are rarely simple. A primer may explode because heat was applied during preparation. Guncotton may detonate during demolition work despite the presence of experienced personnel and apparently familiar procedures. A breech may fail even when the gun crew believes the weapon is correctly prepared. A grenade may function correctly and still kill because the drill failed. A fuze may be defective, but only reveal itself when combined with a particular loading force. A shell fired decades earlier may still kill or injure because it remains live as unexploded ordnance.

This is why New Zealand Army Ammunition Technical Officers and Ammunition Technicians remain essential.

Their role after an incident is not to ask, “Who is to blame?” Their task is to ask, “What happened, why did it happen, and what must be changed to prevent it happening again?”

That approach honours those who have been injured or killed in ammunition incidents far more effectively than blame ever could. It turns loss into evidence, evidence into lessons, and lessons into safer training for those who follow, just as it has done for more than a century of New Zealand ammunition history.

The history of ammunition accidents in New Zealand military service, from Shelly Bay, Mahanga Bay and Fort Ballance, through Trentham and Waiouru, shows that ammunition safety has always depended on technical knowledge, disciplined investigation, accurate reporting and the willingness to learn from failure. That is the lesson history keeps repeating: each generation encounters its own version of the same failure, sometimes at fatal cost, and each generation has had to relearn that understanding, not blame, is what actually prevents the next one.

For the Ammunition Technical Officer and Ammunition Technician, that remains one of the most important duties of all.

The Trentham 1942 grenade fatality currently provides the strongest New Zealand historical example for explaining the complexity of ammunition technical investigation. The Waiouru 1959 25-pounder accident and the Waiouru 1997 FH-2000 accident provide strong examples of technical control, suspect ammunition, and batch or nature-level risk.

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Notes

[1]  In Military service, William Horrocks Heighton was known as William Ross. Ross was adopted as a nom de theatre by the deceased when he was following the profession of an actor, and it was by this name that he was universally known among his companions. “An explosion at the forts,” New Zealand Mail, Issue 993, 13 March 1891, https://paperspast.natlib.govt.nz/newspapers/NZMAIL18910313.2.156.17.

[2] “Report on the New Zealand Forces,” Appendix to the Journals of the House of Representatives, 1891 Session II, H-12  (1891).

[3] “Report of the Commissioners,” Auckland Star, Volume XXII, Issue 103, 2 May 1891, https://paperspast.natlib.govt.nz/newspapers/AS18910502.2.6.

[4] “Shelly Bay Commission,” New Zealand Times, Volume LII, Issue 9298, 19 May 1891, https://paperspast.natlib.govt.nz/newspapers/NZTIM18910519.2.66.

[5] “Report on the New Zealand Forces,”  5.

[6] “Report on the New Zealand Forces,” Appendix to the Journals of the House of Representatives, 1892 Session I, H-12  (1892): 5, https://paperspast.natlib.govt.nz/parliamentary/AJHR1892-I.2.3.3.14.

[7] “Defence Forces of New Zealand (Report on the ), by Colonel A.P Penton, RA, Commander of the Forces,” Appendix to the Journals of the House of Representatives, 1900 Session I, H-19  (1 September 1900): 2, https://paperspast.natlib.govt.nz/parliamentary/AJHR1900-I.2.3.2.40.

[8] “The Inquest,” Star (Christchurch), Issue 6559, 9 August 1899, https://paperspast.natlib.govt.nz/newspapers/TS18990809.2.24.

[9] “Shelly Bay Commission.”

[10] “Shelly Bay Commission.”

[11] “Defence Forces of New Zealand (Report on the ), by Colonel A.P Penton, RA, Commander of the Forces,”  2.

[12] “The Fatality at the Forts,” Evening Post, Volume LXVIII, Issue LXVIII, November 7 1904, https://paperspast.natlib.govt.nz/newspapers/EP19041107.2.22.

[13] “The Fatality at the Forts.”

[14] “Inquest on Gunner Hay,” Grey River Argus, 24 May 1906, https://paperspast.natlib.govt.nz/newspapers/GRA19060524.2.21.2.

[15] “The new powder magazine,” South Canterbury Times, Issue 2414, (Evening Post, Volume XVIII, Issue 102), 27 October 1879, https://paperspast.natlib.govt.nz/newspapers/EP18791027.2.28; “New Power magazine at Mount Eden,” New Zealand Herald, Volume VIII, Issue 2377 (Auckland), 7 September 1871, https://paperspast.natlib.govt.nz/newspapers/NZH18710907.2.18.

[16] “Duvall, Arthur,” Personal File, Archives New Zealand R22203178 (Wellington) 1898.

[17] “Remarkable Evidence,” Wanganui Chronicle, Volume 75, Issue 150, 28 June 1932, https://paperspast.natlib.govt.nz/newspapers/WC19320628.2.74.

[18] “Ivory, William “, Personal File, Archives New Zealand 1916-1933, http://ndhadeliver.natlib.govt.nz/delivery/DeliveryManagerServlet?dps_pid=IE20515584.

[19] “On Service,” Evening Post, Volume XCVI, Issue 21, 24 July 1918, https://paperspast.natlib.govt.nz/newspapers/EP19180724.2.45.

[20] “Bomb Tragedy,” Evening Post, Volume CXXXIII, Issue 62, 14 March 1942, https://paperspast.natlib.govt.nz/newspapers/EP19420314.2.69.

[21] “Public Warning,” Nelson Evening Mail, Volume 80, 30 January 1945, https://paperspast.natlib.govt.nz/newspapers/NEM19450130.2.45.

[22] “Shell 43 Years Old,” Central Hawke’s Bay Press, Volume 41, Issue 10, 13 January 1945, https://paperspast.natlib.govt.nz/newspapers/CHBP19450113.2.22.8?items_per_page=10&page=30&query=ammunition+accident&snippet=true.

[23] “Action Pending Report,” Press, Volume XCVIII, Issue 28941, 8 July 1959, https://paperspast.natlib.govt.nz/newspapers/CHP19590708.2.147.

[24] “Soldiers die when grenade explodes,” Press, Volume CXIV, Issue 33459, 14 February 1974, https://paperspast.natlib.govt.nz/newspapers/CHP19740214.2.22.

[25] “Army cadet killed, two others hurt,” Press, 28 June 1982, https://paperspast.natlib.govt.nz/newspapers/CHP19820628.2.21.

[26] The 155mm Gun Howitzer Chamber Explosion on 9 Mar 97 in New Zealand “, Mindef News Release  (28 June 1997), chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.nas.gov.sg/archivesonline/data/pdfdoc/MINDEF_19970628001.pdf.