M1920 (other)
Under the old Model-year nomenclature system many different pieces of equipment had the same Model number. * 16-inch howitzer M1920 * 14-inch M1920 railway gun * 4.7 inch Gun M1920 on Carriage M1920 See also * M1918 (other) M1918 may refer to: * M114 155 mm howitzer * M1918 Browning Automatic Rifle * Beretta M1918 * M1918 light repair truck * 3-inch Gun M1918 * Ford 3-Ton M1918 World War I tank * M1918 240 mm Howitzer * Mauser 1918 T-Gewehr * M1918M1 155mm Gun, US ...

16-inch Howitzer M1920
The 16-inch howitzer M1920 (406 mm) was a coastal artillery piece installed to defend major American seaports between 1922 and 1947. They were operated by the United States Army Coast Artillery Corps. They were installed on high-angle barbette mountings to allow plunging fire. Only four of these weapons were deployed, all at Fort Story, Virginia. All were scrapped within a few years after World War II. History Around the outbreak of World War I in 1914 it was noted that the rapid development of dreadnought battleships might soon render US coast defenses obsolescent. These had been constructed 1895-1915 under the Endicott and Taft programs. The United States Army's initial response was to place some existing 12-inch guns on high-angle long-range mountings. This program had barely commenced when the American entry into World War I occurred in April 1917. The Coast Artillery Corps was tasked with operating almost all US-manned heavy and railway artillery in that war, as they wer ...
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14-inch M1920 Railway Gun
The 14-inch M1920 railway gun was the last model railway gun to be deployed by the United States Army. It was an upgrade of the US Navy 14"/50 caliber railway gun. Only four were deployed; two in the Harbor Defenses of Los Angeles and two in the Panama Canal Zone, where they could be shifted between the harbor defenses of Cristobal (Atlantic) or Balboa (Pacific). History After the close of World War I, the US Army wanted to incorporate the lessons learned from other railway gun mounts and fulfill coastal artillery requirements for hitting a moving target. An effort to design a more universal mount for the Navy's Mk. IV 14"/50 caliber gun was undertaken. The primary difference from the earlier Navy versions lies in the M1920 carriage, which could be raised and lowered. Prepositioned fixed mounts were installed at the forts, and the gun's rail trucks could be taken out from under the frame. After the removal of the rail trucks, the gun was lowered and bolted onto a pivot poi ...
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