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| 155 mm M114 | |
|---|---|
| Name | 155 mm M114 |
| Caption | M114 155 mm howitzer in service |
| Origin | United States |
| Type | Towed howitzer |
| Service | 1942–present (limited) |
| Designer | United States Army Ordnance Corps |
| Design date | 1941–1942 |
| Manufacturer | Rock Island Arsenal; Watervliet Arsenal; various contractors |
| Production date | 1942–1953 |
| Number | approx. 6,000 |
| Weight | 5,800 kg (combat) |
| Length | 6.94 m (travel) |
| Part length | 3.79 m L/24.5 |
| Caliber | 155 mm |
| Action | Hydro-pneumatic recoil system |
| Rate | 3–4 rpm (sustained) |
| Velocity | 563 m/s (typical shell) |
| Range | 14,600 m (standard high-explosive) |
| Carriage | Split trail |
| Elevation | −2° to +63° |
| Traverse | 50° |
155 mm M114
The 155 mm M114 is an American towed howitzer developed during World War II and widely used by the United States Army and allied forces through the mid-20th century. Designed for corps- and division-level fire support, it combined a 155 mm caliber barrel with a split-trail carriage for mobility and stability. The M114 saw service in major conflicts including World War II, the Korean War, and the Vietnam War, and was exported to numerous countries across NATO and other alliances.
Development began in 1941 under the supervision of the United States Army Ordnance Corps to replace older heavy pieces such as the 155 mm GPF variants used in World War I and interwar modernizations. The design team incorporated lessons from the Battle of France and mechanized warfare studies conducted by the United States Army Field Artillery School at Fort Sill. Contractors including Rock Island Arsenal and Watervliet Arsenal produced prototypes evaluated against competing designs from private firms and government arsenals. Key design goals included increased range compared with earlier 155 mm guns, improved towing compatibility with trucks like the M35 2½-ton cargo truck and half-track tractors such as the M4 High Speed Tractor, and simplified maintenance for forward-deployed units in theaters like North Africa Campaign.
The carriage used a split-trail arrangement similar to contemporaneous designs fielded by British Army and French Army arsenals, enabling wide traverse and rapid emplacement. Recoil management employed a hydro-pneumatic mechanism developed from earlier hydro-spring and hydraulic recoil experiments overseen by the National Defense Research Committee and wartime ordnance engineers. The breech used an interrupted screw design derived from proven European patterns adopted by the Ordnance Department.
The M114 has a 3.79 m (L/24.5) barrel offering a balance between projectile velocity and barrel life, chambered for 155 mm projectiles standardized under United States and NATO ammunition tables. The piece weighs approximately 5,800 kg in combat configuration, with a trail spread and limbering system compatible with common prime movers issued to United States Army Air Forces and Army ground units. Elevation ranges from −2° to +63°, with a maximum traverse near 50° without repositioning trails.
The recoil system provides consistent return for rates of fire around 3–4 rounds per minute sustained under trained crews drawn from units like the Field Artillery Branch (United States) and allied artillery regiments. Sighting equipment included panoramic sights influenced by designs used by the Royal Artillery and optical components supplied by firms associated with the Ordnance Department. The howitzer fired separate-loading bagged charges and projectiles, enabling charge selection from a series of increments used in targeting doctrine developed at Fort Sill.
First deployed in late World War II campaigns in Italy and the European Theatre of World War II, the M114 provided corps-level fire for divisions participating in operations such as the Anzio landings and the Normandy Campaign. Postwar, it became a staple in US Army Europe during the early Cold War and was widely issued to Republic of Korea Army forces during the Korean War. In Vietnam War operations, the M114 served in fixed firebases supporting units like the 1st Cavalry Division (Airmobile) and 101st Airborne Division (United States), although its towed nature limited mobility in dense jungle and counterinsurgency scenarios.
Many NATO armies, including the French Army, West German Bundeswehr, Italian Army, and Turkish Land Forces, adopted the M114 under military assistance and sales programs administered alongside organizations such as the Mutual Defense Assistance Program. Over time it was progressively replaced by self-propelled systems and newer towed designs such as the M198 howitzer and later the FH70 in allied inventories.
The M114 fired 155 mm separate-loading ammunition compatible with United States technical manuals and later standardized with NATO 155 mm rounds. Typical munitions included high-explosive (HE) shells, white phosphorus (WP) smoke, illumination rounds, and later precision and improved conventional munitions developed during Cold War procurements overseen by the United States Army Materiel Command. Propellant was provided in bagged increments allowing charge selection for ranges up to approximately 14,600 m with standard charge tables; range-extending charges and improved projectile aerodynamics later modestly increased reach.
Ballistic performance produced a muzzle velocity near 563 m/s for standard HE, with accuracy and dispersion factors governed by barrel wear, crew drill standardized at Fort Sill, and meteorological corrections applied using procedures from United States Army Field Artillery School doctrine. The gun supported interdiction, counterbattery, and direct support missions coordinated via fire direction centers linked to command echelons such as Corps (military formation) headquarters.
Production spanned several contractor variants and minor modifications including carriage reinforcements, updated towing lunette designs compatible with newer prime movers, and corrosion-resistant finishes for tropical service in theaters like Southeast Asia. Specialized iterations incorporated shield fittings for limited crew protection influenced by lessons from urban fighting in World War II and Cold War contingency planning. Postwar upgrades by allied nations produced localized changes such as improved sights, breech modifications, and mounting adaptations for motorized tractors in NATO inventories.
Primary operator was the United States Army, with subsequent service in the United States Marine Corps and reserve formations. International users included United Kingdom, France, West Germany, Italy, Turkey, Greece, Israel, South Korea, Japan Self-Defense Forces, Philippines, Pakistan, India, and numerous Latin American and African militaries supplied through U.S. assistance programs. Many operators retired the M114 over the late 20th century in favor of self-propelled artillery such as the M109 howitzer or modern NATO-standard systems, though some maintained examples in reserve or for ceremonial roles into the 21st century.