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| M1918 155 mm howitzer | |
|---|---|
| Name | M1918 155 mm howitzer |
| Origin | United States |
| Type | field howitzer |
| Service | 1918–1945 |
| Used by | United States Army; France (limited); United Kingdom (evaluation) |
| Wars | World War I; World War II (limited/posture) |
M1918 155 mm howitzer The M1918 155 mm howitzer was an American heavy field howitzer developed during World War I and deployed into the interwar period and early World War II. Designed to provide corps- and army-level indirect fire, it bridged earlier European designs and later American artillery such as the M1 howitzer. The piece saw service with units organized under the American Expeditionary Forces, supported operations linked to the Meuse-Argonne Offensive, and influenced subsequent ordnance planning at facilities like the Watervliet Arsenal and Rock Island Arsenal.
Development began as the United States sought to equip the American Expeditionary Forces with heavy artillery comparable to models fielded by the French Army, British Army, and German Empire. Ordnance Bureau efforts coordinated with the Chief of Ordnance (United States Army) and industrial partners including Bethlehem Steel, Westinghouse, and Baldwin Locomotive Works to adapt barrel, carriage, and recoil systems. Drawing conceptual influence from the French Canon de 155 C modèle 1917 Schneider and the British BL 6-inch 26 cwt howitzer, designers incorporated a hydro-spring recoil mechanism and a box trail carriage for stability. The breech mechanism reflected practices codified by the U.S. Army Ordnance Department and was tested at ranges evaluated by observers from the Corps of Engineers (United States Army). Prototypes were trialed at Aberdeen Proving Ground with firing data collected alongside representatives of the National Defense Act (1916) procurement offices.
The M1918 featured a nominal caliber of 155 mm (6.1 in), a tube length conducive to high-angle fire, and a separate-loading, bagged-charge ammunition handling similar to European designs used by the French Army and Royal Artillery. The breech employed an interrupted-screw mechanism consistent with practices at the U.S. Army Ordnance Corps and allowed for rapid obturation under heavy charges. Recoil was absorbed by a hydro-spring assembly, tested according to trials overseen by the Ordnance Board. Elevation and traverse controls allowed for high-angle plunging fire useful in the mountainous sectors faced by the Italian Front observers. Carriage weight and wheel configuration reflected rail and road transport constraints examined by the Quartermaster Corps and logistics planners attached to the American Expeditionary Forces.
Field modifications were effected by depot-level workshops at Rock Island Arsenal and the Watervliet Arsenal, producing carriage reinforcements, trail spades, and limber adaptations for towing by Liberty truck and horse teams used by the A.E.F. Services of Supply. Some guns received updated sighting equipment derived from trials at Aberdeen Proving Ground and incremental changes to recoil settings prompted by feedback from commanders in the Meuse-Argonne Offensive and training centers at Camp Jackson (South Carolina), Camp Lewis, and Camp Dix. Later handheld fire-control aids incorporated principles from ballistic tables promulgated by the Ordnance Department and training manuals issued by the Field Artillery School (United States Army) at Fort Sill.
The M1918 equipped heavy artillery regiments assigned to corps-level formations within the American Expeditionary Forces during late World War I, where it supported offensives including the Meuse-Argonne Offensive and operations coordinated with the French Fourth Army and British Expeditionary Force. After the armistice, surviving pieces remained in US inventories and were allocated to training units at Fort Sill and garrison posts such as Fort Riley. During the interwar period the howitzer was examined by planners responding to lessons from the Washington Naval Conference era and the evolving doctrines studied by officers attending the Command and General Staff College (United States). Limited service continued into early World War II in coastal and training roles while newer systems like the M1 155 mm howitzer and towed guns acquired from allies supplanted it. Salvage and reclamation operations at depots such as Letterkenny Army Depot and Aberdeen Proving Ground redistributed barrels and parts to other programs.
The weapon fired separate-loading projectiles with bagged propellant charges similar to French and British heavy howitzers of the period; shells included high-explosive rounds designed by munitions bureaus at Picatinny Arsenal, shrapnel rounds, smoke, and limited chemical-capacity projectiles influenced by doctrines then under study by the Chemical Warfare Service. Ballistics tables were developed by the Ordnance Department and tested at ranges alongside records maintained by the Coast Artillery Corps and field artillery boards. Maximum effective range and rate of fire depended on charge selection and barrel wear, with accuracy factors assessed during trials at Aberdeen Proving Ground and firing competitions held by the Field Artillery School (United States Army).
Production contracts were awarded to American heavy industry during 1917–1919, involving firms such as Bethlehem Steel, Westinghouse, Baldwin Locomotive Works, and smaller subcontractors coordinated by the Ordnance Department. Manufacturing and fitment work was overseen by arsenals like Watervliet Arsenal and Rock Island Arsenal, with acceptance testing at Aberdeen Proving Ground. Postwar surplus units entered training establishments at Fort Sill, Fort Benning, and Schofield Barracks; some pieces were loaned to allied services for evaluation by the French Army and British Army before being superseded by interwar procurement programs. Logistical records at the Quartermaster Corps document distribution, maintenance cycles, and retirements through the 1930s and early 1940s.
Surviving examples of the M1918 are preserved at military museums and outdoor displays associated with institutions like the National Museum of the United States Army, Fort Sill National Historic Landmark and Museum, and regional collections curated by the American Legion and local historical societies tied to former arsenals. The design's influence persisted in doctrinal writings at the Field Artillery School (United States Army) and in technical lessons that informed the development of the M1 155 mm howitzer and later NATO-standard 155 mm systems adopted during the Cold War. Collectors, historians at the Smithsonian Institution, and restoration teams at the U.S. Army Ordnance Museum have documented components, carriage details, and firing tables to preserve the howitzer's technical heritage.
Category:Artillery of the United States Category:World War I artillery of the United States