T20 Medium Tank T20 Medium Tank The Medium Tank T20 was part of a series of medium tanks designed by the United States during the Second World War, to be the successor to the Medium Tank M4 "Sherman", and culminated in the M26 Pershing. Almost immediately after the M4 Sherman was standardized, the US Ordnance Department started work on a successor. The Ordnance Department had already been working on heavily armored infantry tank design for the British, using M4 parts. The new project was started on the 25 May 1942, it was originally designated M4X. Starting with the T20, the Ordnance Department initially
Medium tank battle tank in most countries. The first tanks to carry the name Medium appeared in the First World War with the British Medium Mark A "Whippet". It was smaller and lighter than the British heavy tanks and only carried machine guns. The medium tank doctrine came into use in the interwar period. Its existence outlasted the super-heavy tank and heavy tank and gradually transitioned into the main battle tank. Medium tanks of the interwar period included the British Vickers Medium Mark II and the Soviet multi-turreted T-28. In the period leading up to World War II, the British stopped using