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| 75 mm gun M3 | |
|---|---|
| Name | 75 mm gun M3 |
| Origin | United States |
| Type | Tank gun |
| Service | 1940s–1950s |
| Designer | U.S. Army Ordnance Department |
| Design date | 1940–1941 |
| Manufacturer | U.S. Ordnance Department |
| Production date | 1941–1945 |
| Cartridge | 75×350mmR |
| Caliber | 75 mm (2.95 in) |
| Breech | Vertical sliding-block |
75 mm gun M3 The 75 mm gun M3 was an American tank gun developed in 1940–1941 for use in medium tanks and armored vehicles during World War II. It served as the main armament of the M4 Sherman medium tank family and was fitted to vehicles that saw action in theaters such as Operation Torch, the North African campaign, the Italian Campaign, and the Western Front. The M3 balanced logistical commonality with the U.S. Ordnance Department's requirements and allied interoperability.
Development began after the U.S. Army analyzed armored engagements involving the French campaign of 1940, Battle of France, and observations from the Soviet Union and United Kingdom. The Ordnance Department adapted the existing M2A1 3-inch gun and sought to provide higher explosive content for anti-infantry use while retaining anti-armor capability for confrontations like Battle of Kursk and projected clashes with Wehrmacht forces. Design work involved coordination among Saginaw Steering, Bethlehem Steel, and Ordnance engineers in Rock Island Arsenal and Watervliet Arsenal. The resulting M3 used a shortened, lower-velocity liner compared with contemporary 3-inch gun M1918 pieces to fit the turret ring and mantlet constraints of the M4 Sherman and related designs produced by Fisher Body, American Locomotive Company, Ford Motor Company, and Chrysler.
The M3 was a 75 mm (2.95 in) caliber, breech-loaded gun with a vertical sliding-block breech and hydro-pneumatic recoil system adapted from earlier U.S. Army Coast Artillery Corps practices. It chambered the 75×350mmR cartridge and used a single-piece jacketed barrel with a removable liner in some production runs machined at Watertown Arsenal and Springfield Armory. The gun featured a low-profile mantlet for turrets produced by Saginaw and Marmon-Herrington and was mounted on trunnions with limited elevation and depression compared to guns like the 17-pounder used by British Armed Forces. Fire-control integration was made with sights from Singer Manufacturing Company subcontractors and coaxial machine guns supplied by Browning.
Ammunition types included high-explosive (HE), high-explosive anti-tank (HEAT), armor-piercing capped ballistic capped (APCBC), and smoke rounds supplied through ordnance depots in Aberdeen Proving Ground and Rock Island. Muzzle velocity varied by projectile: APCBC rounds achieved approximately the velocities required for penetration against early Panzer III and Panzer IV armor, while HE rounds provided fragmentation effects useful against fortifications observed at Anzio and Monte Cassino. The M3's ballistic performance prompted tactics emphasizing flanking maneuvers in engagements with heavily armored Tiger I and Panzer V Panther tanks encountered later in the war, paralleling lessons from Operation Cobra and the Battle of the Bulge.
Variants arose as manufacturers and field units adapted the M3 for different platforms. The gun saw shortened and lengthened chamber trials with different recoil springs at Aberdeen Proving Ground and was fitted with muzzle brakes, thermal sleeves, and counterweights in some M4 Sherman subtypes produced by Baldwin Locomotive Works and American Radiator Company. Modified mountings allowed installation in light tanks such as prototypes built by Stuart-series contractors and in assault gun conversions by Diamond T and Pacific Car and Foundry. Postwar modernization programs in France and Israel included relined barrels and locally produced ammunition by arsenals like Atelier de Construction de Rueil.
The M3 entered service with early M4 variants deployed to Operation Torch forces and to lend-lease recipients including Soviet Union and United Kingdom units, participating in campaigns from North Africa to Normandy. Crews adapted tactics taught at Fort Knox and Camp Bowie to account for the M3's strengths in HE and mobility in combined arms operations with United States Army Air Forces close air support doctrine. Encounters with German Panzer formations during Kasserine Pass and later during Operation Market Garden influenced upgrades and combined-arms training with units attached to U.S. First Army and U.S. Third Army formations.
Mass production was coordinated among U.S. manufacturers organized under the War Production Board and supervised by the Ordnance Department. Major producers of turrets, mountings, and barrels included Fisher Body, J. Walter Christie subcontractors, and ordnance plants at Rock Island Arsenal. The M3 was supplied concurrently to U.S. armored divisions, Free French Forces, Polish Armed Forces in the West, and lend-lease partners. Logistics hubs in Liverpool, Alexandria, and Murmansk handled shipment of guns and ammunition for allied operations.
Primary users included the United States Army, United States Marine Corps, British Army, Free French Forces, Soviet Union under Lend-Lease, and postwar operators such as France and Israel. The gun saw combat in major battles and campaigns including Operation Torch, the Tunisia Campaign, the Battle of Sicily, the Battle of Normandy, the Italian Campaign, and counterinsurgency actions during early Israeli service. Surplus M3-armed vehicles influenced armored doctrine in several nations during the late 1940s and 1950s.
Category:World War II artillery of the United States