To sustain and maintain the New Zealand Division on the Western Front during the First World War, New Zealand established a network of training camps, hospitals and other administrative facilities in the United Kingdom. At Sling Camp in the centre of Salisbury Plain, the New Zealand Army Ordnance Corps (NZAOC) established an Ordnance Depot to provide Ordnance Support to all the Units of the New Zealand Expeditionary Force (NZEF) located in the Southern Command area of the United Kingdom. Comprised of a small number of NZAOC soldiers, the Sling Ordnance Depot performed all its duties from its inception in 1916 until final demobilisation in 1920.
Officially called the 4th New Zealand Infantry Brigade Reserve Camp, Sling Camp is the most well-known of the NZEF training camps in England. Throughout the war, Sling Camp housed up to 5000 men undergoing training and recuperation at any one time. To provide ordnance support to Sling Camp, the NZEF Chief Ordnance Officer, Captain Norman Joseph Levien, established the Sling Ordnance Depot during the period May-July 1916 The Sling Ordnance Depot was not only responsible for NZEF units in Sling Camp but also for all the NZEF units located in the Southern Command Area, including;
- the New Zealand Command Depot and No 3 General Hospital at Codford,
- the Artillery and Medical Corps at Ewshot;
- the Signals at Stevenage;
- the Engineers, Tunnellers and Māori’s at Christchurch,
- No 1 NZ General Hospital at Brockenhurst, and
- The Convalescent Discharge Depot at Torquay.
The Sling Depot was under the command of the Ordnance Officer NZEF in Southern Command, aided by a small staff of NZAOC Non-Commissioned Officers (NCOs). Additional manpower to assist in the handling and management of stores was provided by supported units, with up to eighty other men attached to the depot during periods of high activity. Eighteen miles from Sling and with over three thousand men based at Codford, an auxiliary ordnance depot was also established there under the control of an NCO.
Second Lieutenant Alfred James Bond was appointed as the first Ordnance Officer at Sling in July 1916. Bond had been attached to the NZ Ordnance Depot at Alexandra from 30 April 1915 and was promoted to Second Lieutenant on19 January 1916, followed by his transfer into the NZAOC on 2 March 1916. Moving with the NZ Division to France, Bond was eventually transferred to the HQ of the NZEF in June 1916 and appointed as the Ordnance Officer for NZEF Units in the Southern Command in July 1916. Bond remained at Sling until June 1917, when he was seconded for duty with No 5 Light Railway Section in France. Bond had been under scrutiny since March 1917 when a court of inquiry had found fault with his leadership, which had led to the death of NZAOC Armourer Sergeant John William Allday as the result of a self-inflicted gunshot wound on 9 January 1917.
Bond was replaced as Ordnance Officer by Second Lieutenant William Henchcliffe Simmons. Simmons had initially served in the Samoa Expeditionary Force after which he saw service at Gallipoli before transferring to the NZAOC. At the time of Bonds secondment to the Light Railway Section, Simmons was serving as a Conductor in the NZ Division in France. Promoted to Second Lieutenant, Simmons served as the Ordnance Officer at Sling until August 1917, when Bond returned from his secondment.
Bond remained as Sling Ordnance Officer until January 1918, when Captain Herbert Henry Whyte, MC arrived for temporary duty as the Sling Ordnance Officer. Whyte was an NZ Artillery officer who along with NZAOC Officer Lieutenant Charles Ingram Gossage had completed a course of instruction in Ordnance duties at the Woolwich Arsenal. Whyte alternated between the Sling depot and Headquarters in London until 8 May 1918, when he took up the full-time appointment of Sling Ordnance Officer. Whyte remained as the Ordnance Officer of the Sling Depot until January 1920 when he was appointed as the acting NZEF Assistant Director of Ordnance Services.
All units in the NZEF Southern Command raised indents on the Sling Depot, which after checking by the Ordnance Officer, were satisfied from existing stock or sourced from the appropriate supply source for direct delivery to units. The primary source of supply for general ordnance stores was the British Ordnance Depot at Tidworth, which was conveniently located only five miles from Sling. Occasionally stores were drawn from the British Ordnance Depots at Hilsea and Warminster. The relationship with the Tidworth Depot was close, with an NZAOC SNCO seconded there to manage the New Zealand indents. Clothing and Textiles were drawn from the New Zealand Ordnance Depot at Farringdon Road in London, or directly for the Royal Army Clothing Department (RACD) Southampton Depot.
In addition to the provision of general ordnance stores, clothing and textiles, the Sling Ordnance Dept also managed an Armourers Group and a Salvage Depot. The Armourers Group was equipped with all the tools and accessories necessary for the repair of small arms, machine guns, bicycles, primus stoves, steel helmets and other like items 
The Salvage Depot had developed during 1917as a measure to recycle unserviceable stores to minimise waste and ensure financial savings. All UK NZEF units returned their part-worn and unserviceable clothing and textile items to the Salvage Depot for sorting and further action.
All Serviceable and repairable Service Dress Clothing was sent to the Farringdon Road Depot in London for cleaning, repair, and holding for further issues. Serviceable garments such as socks and underwear were sent to the Steam Laundry Company at Salisbury, where, after cleaning were returned to the Sling Depot and held as stock. Unserviceable textile stores, such as web gear, were forwarded to the Imperial Salvage Depot at Dewsbury.
The Salvage Depot graded Boots as either repairable or unserviceable. Repairable boots were sent to either the Farringdon Road Depot or the Southern Command Boot Repair Depot at Southampton for repair and reintegration back into stock. Unserviceable boots were sold by auction in Southampton.
Unserviceable general stores that were not repairable on-site were placed onto a Board of Survey, of which the Ordnance Officer was a member, classed as unserviceable and returned to the British ordnance Depot from where they were initially sourced, either Tidworth, Hilsea or Warminster.
In addition to the processing of clothing, textiles and general stores, the Salvage Dept also collected wastepaper and tin cans for recycling.
On the signing of the armistice, Sling switched from training camp to a demobilisation centre for all “A Class” men, and the role of the Ordnance Depot became one closing units and disposing of equipment, while also equipping men returning to New Zealand. The demobilised plan called for little equipment used by the NZEF during the war to be backloaded to New Zealand. The exception was rifles and web equipment. Ordnance inspected, overhauled and reconditioned the Rifles with the best twenty thousand returned to New Zealand as transports became available. Web Equipment was cleaned, reconditioned and returned to New Zealand as space became available. The NZAOC Staff in NZEF Headquarters in London oversaw the purchase of enough equipment to equip two Infantry Divisions and One Mounted Rifle Brigade. Again, as transport became available, this was dispatched to New Zealand. The plan was for key NZAOC men to accompany each consignment to assist with its receipt in New Zealand. In addition to closing units and disposing of equipment, the primary role of the NZAOC was to issue men returning to New Zealand with New Uniforms.
The demobilisation process required holding a larger stock of clothing. On 23 November 1918, the existing Sling Ordnance Depot was closed and relocated to larger premises a short distance away in the middle area of Bulford Camp. The NZ Ordnance Depot at Bulford became the central reception depot for all Ordnance and Salvage for NZEF units in the UK. The Salvage Depot became the busiest and most important branch of the Bulford Depot, with up to eighty additional men added to its staff. In the six months leading up to June 1919, the Bulford disposal depot enabled credits of £38000 (2019 NZD$ 4,12,9535.50) to be made on behalf of the NZEF.
Ceasing activities with the departure of the last New Zealand soldiers repatriated to New Zealand. The Sling Ordnance Depot ceased operations after three years of service. Its final administrative functions were taken over by the NZAOC Headquarters in London, which from February 1920 were under the command of Captain William Simmons, who remained as the Officer in Charge of NZ Ordnance in England until October 1920.
No nominal roll of NZAOC soldiers who served in the Sling Depot has survived, but the following men are now known to have served at the depot.
- 23/1318 Armourer Sergeant John William Allday
- 12/689 Lieutenant Alfred James Bond
- 2/3001 Sergeant Herbert William Grimes
- 10/1251 Staff Sergeant Henry Richard Harnett
- 10/921 Sergeant Leslie Vincent Kay
- 23/659 Temporary Capitan William Henchcliffe Simmons
- 2/284 Captain Herbert Henry Whyte
- 6/572 Sergeant Henry Wilkinson
 H. T. B. Drew, The War Effort of New Zealand: A Popular (a) History of Minor Campaigns in Which New Zealanders Took Part, (B) Services Not Fully Dealt within the Campaign Volumes, (C) the Work at the Bases, Official History of New Zealand’s Effort in the Great War: V.4 (Whitcombe & Tombs, 1923), Non-fiction, 249-53.
 “Levien, Norman Joseph “, Personal File, Archives New Zealand 1914.
 “New Zealand Army Ordnance Corps – War Diary, Summary, 23 November 1918 – 9 June 1919 “, Archives New Zealand Item No R23856659 (1919).
 “Bond, Alfred James,” Personal File, Archives New Zealand 1914.
 “Allday, John William “, Personal File, Archives New Zealand 1914.
 “Simmons, William Henchcliffe “, Personal File, Archives New Zealand 1914.
 Gossage went on to be the NZ Division DADOS “Gossage, Charles Ingram,” Personal File, Archives New Zealand 1914.
 “Whyte, Herbert Henry,” Personal File, Archives New Zealand 1914.
 “Harnett, Henry Richard,” Personal File, Archives New Zealand 1914.
 “New Zealand Army Ordnance Corps – War Diary, Summary, 29 July 1918 “, Archives New Zealand Item No R23856657 (1918).
 P.H. Williams, Ordnance: Equipping the British Army for the Great War (History Press, 2018).
 “New Zealand Army Ordnance Corps – War Diary, Summary, 23 November 1918 – 9 June 1919 “.
 The Ordnance Depot occupied buildings that had formally been used by the NZEF Base Kit Stores which had vacated the premises a few weeks previously. Ibid…