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155mm Gun M-1917, M-1918M1 on Carriages M-1017, M-1917A1, M-1918, M-1918A1, M-2 and M-3
Substitute Standard

The M-1918M1 started out as a French design (Canon de 155mm GPF) and served as the French Army’s standard field gun from 1917 to World War Two, it was used by the U.S. Army as the 155mm Gun M-1917. A slightly modified version was adopted by the AEF in 1918 as the 155mm Gun M-1918. It was used by the United States Army and United States Marine Corps as their primary heavy artillery gun until 1942, when it was gradually replaced by the 155mm Gun M-1A1.

Weight in firing order: 23,302lbs. Elevation and depression: 0 degrees to +35 degrees. Traverse is 30 degrees L/R. Maximum range is 20,100 yards. Rate of fire is 4rpm.

155mm Gun M-1A1 on Carriage M-1
Standard

The 155 mm Gun M1 was a 155 millimeter caliber field gun developed and used by the United States military. Nicknamed "Long Tom", it was produced in M1 and M1A1 variants. Developed to replace the Canon de 155mm GPF (M-1917, M-1918), the gun was deployed as a heavy field weapon during World War II, and also classed as secondary armament for seacoast defense.

Weight in firing order: 30,600lbs. Elevation and depression: 0 degrees to +65 degrees. Traverse is 30 degrees L/R. Maximum range is 25,395 yards. Rate of fire is 1rpm.


8-inch Gun M-1 on Carriage M-2
Standard

In 1919, the Westervelt Board described the ideal heavy gun for future development having a bore of 194mm to 8-inches, a projectile of about 200lbs, and a range of 35,000 yards. More striking was that it be must be road transportable. At this time no other country had such a road-transportable field gun. Low-priority design work occurred until 1924. Serious development began in June 1940 of an 8-inch (203 mm) gun that would have a range of 33,500 yards (30,600 m), a road speed of 25 mph (40 km/h), be transported in two loads weighing no more than 44,000lbs and be suitable for rail movement. The gun used the same projectile as the 8-inch coastal gun and the US Navy's 8-inch cruiser gun. Using the same carriage as the 240 mm howitzer M1 eased development, but the gun was very troublesome and was not standardized until January 1942. The main problems were excessive bore wear and poor accuracy, but it was felt that nothing better could be produced in a timely manner. Thus it entered production at a low rate and in small numbers. Only 139 weapon systems were produced before production ceased in 1945.

Weight in firing order: 69,300lbs. Elevation and depression: +10 degrees to +50 degrees. Traverse is 15 degrees L/R. Maximum range is 35,635yds. Rate of fire is 1rpm.