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| 105 mm M2A1 howitzer | |
|---|---|
| Name | 105 mm M2A1 howitzer |
| Origin | United States |
| Type | Field howitzer |
| Service | 1941–present |
| Wars | World War II, Korean War, Vietnam War, Yom Kippur War, Six-Day War, Suez Crisis, Sino-Indian War, Falklands War |
| Designer | Rock Island Arsenal |
| Design date | 1939–1941 |
| Manufacturer | Rock Island Arsenal, Watervliet Arsenal, Westinghouse Electric Corporation, American Car and Foundry Company |
| Production date | 1940–1953 |
| Weight | 2,260 kg (combat) |
| Length | 4.27 m (travel) |
| Cartridge | 105×372R Separate-loading, cased charge |
| Caliber | 105 mm |
| Action | Breech-loaded, interrupted screw |
| Rate | 6–8 rpm (max) |
| Velocity | 472 m/s (HE) |
| Range | 11,270 m (HE) |
| Carriage | Split trail |
| Elevation | −5° to +65° |
| Traverse | 60° |
105 mm M2A1 howitzer The 105 mm M2A1 howitzer is an American towed field artillery piece developed before World War II and widely used by the United States Army and allied forces during mid‑20th century conflicts. It combined mobility, a balanced weight for motor transport, and sufficient firepower to replace earlier 75 mm M1917 and 3-inch M1902 systems, influencing artillery doctrine in the European Theatre of Operations and Pacific War campaigns. The design and production involved several arsenals and contractors, and the gun saw continuous use, upgrades, and licensed manufacture by numerous nations.
The M2A1 originated from prewar trials at Rock Island Arsenal and requirements issued by the Chief of Ordnance (United States Army), responding to lessons from the Spanish Civil War and studies by the U.S. Army Ground Forces. Design work by Rock Island Arsenal and production engineering at Watervliet Arsenal and private firms such as Westinghouse Electric Corporation emphasized a split‑trail carriage for stability, a hydro-pneumatic recoil system influenced by experiments at Aberdeen Proving Ground, and a large chamber to fire variable propellant charges developed at the Frankford Arsenal. The interrupted screw breech and semi-automatic breechblock reflected practices established by Samuel Colt era ordnance evolution and late interwar advances adopted across NATO partners. The M2A1’s barrel rifling, chamber dimensions, and carriage geometry were standardized under specifications set by the National Defense Research Committee and the Ordnance Department to ease mass production.
The M2A1’s combat weight, travel length, and towing arrangement were optimized for the M3 Half-track and prime movers like the M35 2½-ton truck. The split trail carriage permitted a 60° traverse and elevation to +65°, facilitating both indirect fire in cooperation with forward observers from units like V Corps and direct fire in defensive actions noted by elements of the 101st Airborne Division. The gun fired a 105×372R separate-loading, cased charge round using an interrupted screw breech and a hydro-pneumatic recoil system derived from trials at Fort Sill. The sighting equipment originally used a panoramic telescope patterned after devices tested at Watertown Arsenal and later upgraded to meet standards set by the U.S. Army Ordnance Department. Manufacturing tolerances and material specifications referenced standards promulgated by the American Society for Testing and Materials and procurement overseen by the War Department.
Introduced in 1941, the M2A1 equipped divisional artillery battalions of the U.S. Army and was a staple of infantry divisions and armored divisions during World War II. It saw action in the Normandy landings, the Italian Campaign, the Battle of the Bulge, and island campaigns such as Saipan and Iwo Jima. Postwar, the M2A1 remained in service through the Korean War providing counter-battery and close support for units like the 1st Marine Division and the 2nd Infantry Division. During the Vietnam War artillery units adapted the system for jungle operations and base defense; later, surplus pieces were exported and used in Middle East conflicts including the Suez Crisis and the Yom Kippur War. The howitzer’s longevity is reflected by use by forces during the Sino-Indian War and by various Latin American and African armies into the late 20th century.
The M2 evolved through incremental improvements: the original M2, the improved M2A1 with modified recoil and carriage fittings, and field modifications adapting spades and towing lunette interfaces for compatibility with vehicles like the M4 High Speed Tractor. Some units mounted the barrel on self-propelled chassis such as experimental conversions inspired by the M7 Priest program and influenced by British self-propelled designs like the Sexton (artillery vehicle). Licensed and unlicensed production in countries including United Kingdom, France, Israel, India, and Argentina produced local variants with altered trails, wheels, and recoil systems, and some were rebarreled or rechambered to fire NATO-standard charges as specified by bilateral agreements negotiated with the U.S. State Department.
Ammunition types issued for the gun included high explosive, armor‑piercing, white phosphorus, and illumination rounds, many developed at the Frankford Arsenal and standardized by the Joint Chiefs of Staff ordnance committees. The separate-loading, cased charge system allowed incremental propellant tailoring for ranges from direct-fire engagements at short distance to maximum elevation fire reaching approximately 11,270 meters with HE. Muzzle velocity, achieved with standard charge, was around 472 m/s; crew drills and training doctrines promulgated by Field Artillery School (Fort Sill) enabled sustained rates up to 6–8 rounds per minute under optimal conditions. Fire-control coordination used map data from Army Map Service and forward observers communicating via radio equipment like the SCR-300 and PRC-10.
Beyond the United States, the M2A1 was supplied to United Kingdom under Lend-Lease, used by Canada, Australia, New Zealand, France, Belgium, Netherlands, Greece, Turkey, Israel, India, Pakistan, South Korea, numerous Latin American nations, and several African states. It was fielded by NATO armies during the early Cold War and by non-aligned forces in regional conflicts. Transfers and surplus sales post-World War II expanded its footprint to countries engaged in the Arab–Israeli conflict, the Indo-Pakistani wars, and other regional wars listed by observers at International Institute for Strategic Studies.
Surviving M2A1 howitzers are displayed at institutions such as the National World War II Museum, the Smithsonian Institution, the Royal Canadian Legion museums, and battalion memorials associated with the 82nd Airborne Division and 1st Infantry Division. Restored examples appear in static parks, at annual reunions of artillery associations like the U.S. Field Artillery Association, and in private collections documented by curators at the Imperial War Museum and regional heritage centers in Europe and Australia. Some pieces are maintained in firing condition for ceremonial salutes by military museums adhering to safety protocols from the U.S. Army Center of Military History.
Category:Field artillery Category:World War II artillery of the United States