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DD or duplex drive tanks, nicknamed "Donald Duck tanks", [1] were a type of amphibious swimming tank developed by the British during the Second World War.The phrase is mostly used for the Duplex Drive variant of the M4 Sherman medium tank, that was used by the Western Allies during and after the Normandy Landings in June 1944.
Crab: A modified Sherman tank equipped with a mine flail, a rotating cylinder of weighted chains that exploded mines in the path of the tank. DD tank (from "Duplex Drive"): An amphibious version of the Sherman created by fitting M4A1 and M4A4 with a large watertight canvas housing. This increased displacement so the tank was able to float and ...
In preparation for the invasion of Europe by Allied forces in 1944, an amphibious "swimming" version of the Sherman was used. Extensive work on creating mine-clearance devices to be attached to Shermans in some fashion was also conducted up until the end of the Second World War, such as the Sherman Crab mine-flail tank.
The "Duplex Drive" tank was a Sherman tank converted for amphibious use with twin types of locomotion: tracks and propellers; the design was used by the Allies in the opening phases of the Normandy landings in 1944.
A Sherman DD amphibious tank of 13th/18th Royal Hussars in action against German troops using crashed Airspeed Horsa gliders as cover near Ranville, Operation Overlord, Normandy, 10 June 1944 As the United States approached entry into World War II, armored employment was doctrinally governed by Field Manual 100–5, Operations (published May ...
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Company A was equipped with Deep Wading M4 Sherman tanks, while Companies B and C were equipped with the amphibious Sherman DD tanks. Company D, equipped with M5 light tanks, and the battalion headquarters were not part of the initial landing force. [11]
The "Medium Tank A/T 1" was a tank with inbuilt buoyancy some 24 ft (7.3 m) long and 11 ft (3.4 m) tall. The Valentine, then the M4 Sherman medium tank were made amphibious with the addition of a rubberized canvas screen to provide additional buoyancy and propellers driven by the main