The concept of a vehicle to provide troops with both mobile protection and firepower was not a new one. But in World War I, the increasing availability of the internal combustion engine, armor plate, and the continuous track, as well as the problem of trench warfare, combined to facilitate the production of the tank. The name 'tank' came from British attempts to ensure the secrecy of the new weapons under the guise of water tanks. During the First World War, Britain began the serious development of the tank. Ironically, the Royal Navy led the way with the First Lord of the Admiralty, Winston Churchill, establishing the Landships Committee in early 1915. The military combined with engineers and industrialists, and by early 1916, a prototype was adopted as the design of future tanks. Britain used tanks in combat for the first time in the Battle of Flers-Courcelette on 15 September 1916.

Source: Imperial War Museums