M101 105mm Howitzer

During the Second World War, U.S. artillery regiments consisted of an HQ detachment, one 155mm artillery battalion, and three 105mm artillery battalions. Both the 155mm and 105mm battalions had twelve guns each, divided into three batteries of four guns. That gave each regiment a total of twelve 155mm howitzers, and thirty six 105mm howitzers. With an HE M1 shell fired at 9000 meters, the probable error in range was 41 meters, while the probable error in line was 10 meters.

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Caliber: 105 mm
Weight: 4,980 pounds
Length: 19 feet 6 inches
Barrel Length: 7 feet 7 inches
Shell: 105 x 372R
Caliber: 105 mm
Breech: Horizontal Block
Recoil: Hydro-pneumatic, constant, 42 inches
Carriage: Split Rail
Muzzle Velocity: 1,550 feet/second
Status: Static display
Owner: Estrella Warbirds Museum


The U.S. military artillery designation system was changed in 1962, re-designating the 105mm M2A1 howitzer the M101A1. The gun continued to see service in the Korean and Vietnam Wars. Though a similar model, the M102 howitzer, shared the same roles in battle, it never fully replaced the M101A1. Today, the M101A1 has been retired by the U.S. military, though it continues to see service with many other countries. By the end of the Second World War, 8,536 105mm towed howitzers had been built and post-war production continued at Rock Island Arsenal until 1953, by which time 10,202 had been built.

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