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| 155 mm Howitzer M1918 | |
|---|---|
| Name | 155 mm Howitzer M1918 |
| Origin | United States |
| Type | Howitzer |
| Service | 1918–1945 |
| Used by | United States Army, United States Marine Corps |
| Wars | World War I, Interwar period, World War II |
| Designer | United States Army Ordnance Department |
| Design date | 1917–1918 |
| Manufacturer | Watervliet Arsenal, Rock Island Arsenal, Schenectady |
| Production date | 1918–1920s |
| Number | ~2,000 |
| Weight | 15,300 lb (firing) |
| Length | 21 ft |
| Part length | 9 ft (L/23) |
| Cartridge | separate-loading, cased charge |
| Caliber | 155 mm (6.1 in) |
| Rate | 1–2 rpm |
| Velocity | 1,300 ft/s |
| Range | 6.6 km (3.3 km effective) to 11.7 km max |
| Breech | Interrupted screw |
| Recoil | hydro-spring |
| Carriage | box trail, steel wheels |
| Elevation | −5° to +45° |
| Traverse | 6° |
155 mm Howitzer M1918 The 155 mm Howitzer M1918 was an American medium artillery piece developed to meet urgent World War I requirements and to supplement existing European designs such as the French Canon de 155 C modèle 1917 Schneider and the British BL 6-inch 26 cwt howitzer. Designed and produced by the United States Army Ordnance Department and arsenals including Watervliet Arsenal and Rock Island Arsenal, it entered limited service in late 1918 and remained in use through World War II with multiple updates and variants.
Development began after the American entry into World War I when the American Expeditionary Forces required modern heavy artillery compatible with Allied logistics. Influenced by captured and licensed designs like the Schneider 155mm and the French 155 mm GPF, the United States Army Ordnance Department pursued a domestically producible howitzer with a box trail carriage to simplify manufacture at facilities such as Schenectady and Watervliet Arsenal. Key engineers and overseers from the Ordnance Branch coordinated with wartime procurement offices including the War Department and liaised with Allied staffs at Saint-Cloud and General Headquarters to standardize ammunition and towing arrangements with tractors like the Jeffery Quad and artillery tractors used by the British Army. Production constraints, material priorities set by the War Industries Board, and the Armistice of 1918 limited initial deployment, but the design persisted into interwar rearmament under the Chief of Ordnance.
The M1918 had a 155 mm (6.1 in) caliber bore and a barrel length of approximately 9 ft (L/23), using a separate-loading, cased-charge system similar to French practice adopted by the American Expeditionary Forces. The interrupted screw breech and hydro-spring recoil mechanism were established technologies shared with pieces produced at Watervliet Arsenal and Rock Island Arsenal. The carriage was a heavy box trail with steel wheels and limited 6° traverse, compatible with limbering and towing by tractors in service with the United States Army and United States Marine Corps. Elevation ranged −5° to +45°, enabling high-angle fire for trench-busting roles seen in late World War I operations such as the Meuse-Argonne Offensive. The gun weighed roughly 15,300 lb in firing position and achieved muzzle velocities near 1,300 ft/s, with maximum ranges approaching 11.7 km depending on charge and projectile.
Though too late to affect most World War I campaigns, M1918 pieces equipped several field artillery brigades of the American Expeditionary Forces during the final weeks of the war and served in occupation forces in Germany and on training ranges in the United States. During the interwar period the howitzer was part of the Coast Artillery Corps inventories and appeared in National Guard units organized under the Militia Act of 1903 and later reorganizations directed by the National Defense Act of 1920. In World War II the M1918 was largely relegated to second-line roles, training units, and coastal defense detachments alongside newer weapons like the M1 155 mm Long Tom and the 155 mm gun M1918 Schneider-derived systems, but it still saw limited overseas deployment with artillery groups in theaters including the Philippines and the early stages of the Pacific War.
Production produced minor variations in carriage details, recoil systems, and trail fittings by manufacturers such as Rock Island Arsenal and Watervliet Arsenal, while rebuild programs in the 1920s and 1930s upgraded recoil buffers and sights under programs directed by the Office of the Chief of Ordnance. Field modifications by units in the Philippine Department and Fort Sill included altered towing lunette interfaces for compatibility with tractors like the Fordson 8F and adapters to use newer fire-control devices developed at Aberdeen Proving Ground. Some guns were modified for coastal defense mounting under the supervision of the Coast Artillery Corps and the Engineer Department.
Ammunition was compatible with Allied 155 mm practice: separate-loading shells with multiple propellant charges standardized through intergovernmental coordination at supply depots like Saint-Nazaire and U.S. arsenals. Projectiles included high-explosive, shrapnel, smoke, and chemical types used in World War I doctrine propagated by schools such as the School of Artillery at Fort Sill. Muzzle velocity and range varied with charge and projectile weight; typical high-explosive rounds yielded effective interdiction and counter-battery effects in engagements similar to those in the Argonne Forest and at Belleau Wood when comparing trajectory requirements and explosive effects.
Primary users included the United States Army and the United States Marine Corps; National Guard artillery units retained examples into the 1930s under state designations tied to armories in New York City, Chicago, and San Francisco. Overseas, the howitzer was present with U.S. expeditionary and garrison forces in France after the armistice, and later in Philippine Islands garrisons prior to World War II. Limited foreign interest came from allied procurement channels and surplus sales handled by the War Assets Administration after 1945.
Surviving M1918 howitzers are displayed at institutions and historic sites such as the Fort Sill Museum, the National World War I Museum, and several local military museums associated with former arsenals like Rock Island Arsenal and Watervliet Arsenal. The M1918 influenced subsequent U.S. 155 mm design choices culminating in the M1 155 mm Long Tom and contributed to artillery doctrine codified at Fort Leavenworth and taught by the Field Artillery School. Its presence in interwar inventories aided training continuity for generations of officers and enlisted personnel who later served in World War II campaigns.