tank

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tank Tracked, armoured vehicle mounting a single primary weapon, usually an artillery piece, and one or more machine guns. Modern tanks have an enclosed, fully revolving turret and are heavily armoured; main battle tanks weigh from 35 to 50 tonnes and usually have a crew of four. Developed in great secrecy by the British during World War I, tanks were first employed at the Battle of the Somme (1916).

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