M1917 155 mm gun

M1917 155 mm gun
Name	M1917 155 mm gun
Origin	United States
Type	Field gun
Service	1917–1945
Designer	United States Army Ordnance Bureau
Design date	1917
Manufacturer	Watervliet Arsenal
Weight	13,000 lb
Part length	32 calibers
Cartridge	Separate loading, cased charge
Caliber	155 mm
Velocity	2,300 ft/s
Max range	14,600 yd
Carriage	Single-trail, box trail
Elevation	-5° to +42°
Traverse	6°

M1917 155 mm gun

The M1917 155 mm gun was an American heavy field artillery piece produced during World War I and retained through World War II. Designed by the United States Army Ordnance Bureau and built at Watervliet Arsenal, it provided counterbattery and long-range fire for American Expeditionary Forces and later served in coastal and training roles. The gun bridged prewar European influences and interwar American modernization efforts.

Development and Design

Development began after U.S. entry into World War I when the need for heavy artillery comparable to French and British systems became urgent. Influences included the Canon de 155mm GPF and lessons from the Battle of Verdun, prompting the Ordnance Bureau to adapt proven concepts for American production at Watervliet Arsenal and Rock Island Arsenal. The design emphasized strategic mobility compatible with American Expeditionary Forces logistics, compatibility with existing 155 mm ammunition used by allies such as France and United Kingdom, and manufacturing methods standardized under the National Defense Act of 1916 and wartime procurement overseen by the War Department (United States).

The carriage employed a single-box trail with limited traverse to simplify production and maintenance, while the barrel used a built-up construction and interrupted screw breech similar to contemporary European heavy guns used by French Army (Third Republic) and British Army during World War I. Recoil systems reflected developments from designers studied at Société des Forges et Chantiers de la Méditerranée and workshops that influenced early 20th-century ordnance engineering.

Technical Specifications

The M1917 fired a 155 mm projectile with separate loading charges, using cased propellant standardized across allied stocks shared with Canon de 155mm GPF ammunition types. The barrel length was approximately 32 calibers, providing muzzle velocities comparable to heavy guns fielded by the German Empire on the Western Front, with an effective range of about 14,600 yards. The interrupted screw breech permitted rapid loading consistent with doctrines taught at United States Army Field Artillery School and techniques pioneered by designers examined at École Polytechnique and École d'Application de l'Artillerie et du Génie.

Carriage features included elevation from -5° to +42° and a limited traverse of roughly 6°, requiring gun laying procedures similar to those used by battery organizations in 1918 Allied Hundred Days Offensive operations. The recoil mechanism was hydropneumatic, reflecting contemporary advances tracked by the Ordnance Department (United States) and used on weapons examined during inspections of the Western Front battlefields.

Operational History

Introduced into service in 1917, the M1917 equipped regiments sent to the Western Front as part of the American Expeditionary Forces (AEF). Batteries armed with the M1917 supported operations during the Meuse-Argonne Offensive and other late-1918 actions, coordinating with artillery assets from French Army (Third Republic) and British Expeditionary Force. Postwar, many M1917s remained in U.S. inventories and were issued to National Guard formations governed by provisions of the Militia Act and training centers such as the Field Artillery School (Fort Sill).

During the interwar period the gun saw limited modernization but remained part of coastal defense and training units overseen by the United States Army Coast Artillery Corps and other formations. By World War II, some M1917s were reallocated to secondary roles, including anti-aircraft firing practice, static coastal positions, and reserve artillery formations deployed to support mobilization and home defense plans administered by the War Production Board and Army Ground Forces.

Variants and Modifications

Several modifications adapted the M1917 to evolving needs: carriage adaptations for towing by motor vehicles influenced by motorization programs championed by the Quartermaster Corps, mounting alterations for fixed coastal emplacements under the United States Army Coast Artillery Corps, and rechambering or sighting updates inspired by ordnance reviews conducted at Aberdeen Proving Ground. Some guns received improved recoil systems or muzzle brakes based on research communicated through institutions such as Watertown Arsenal and testing protocols used by Edgewood Arsenal. Limited experimental conversions paralleled contemporary efforts on systems like the M1918 155 mm howitzer and shared components with export patterns observed in postwar sales to allies.

Users and Service Employment

Primary users included the United States Army and reserve elements such as the National Guard (United States), while captured or surplus pieces occasionally reached allied nations through interwar transfers and lend-lease-adjacent arrangements influenced by diplomatic ties with France and other partners. Within U.S. forces, employment spanned front-line AEF batteries in World War I, coastal defense units during the interwar years, and training establishments like Camp Zachary Taylor and Fort Sill prior to and during World War II. Organizational doctrine for crews reflected training models promulgated by the Field Artillery School (Fort Sill) and staff methods coordinated at General Headquarters (United States Army).

Surviving Examples and Preservation

Surviving M1917 guns are preserved at military museums and memorials, often displayed near installations with historical ties to their service, such as Watervliet Arsenal Museum exhibits, Fort Sill National Historic Landmark, and municipal war memorials connected to World War I commemorations like those associated with the Meuse-Argonne American Cemetery and Memorial. Restoration and preservation efforts are supported by organizations including the U.S. Army Center of Military History and local historical societies that coordinate conservation similar to projects for artillery preserved from the World War I centennial commemorative initiatives.

Category:Field artillery of the United States Category:World War I artillery of the United States Category:155 mm artillery