A dummy tank, usually inflatable or wooden, is a type of decoy that either is intended to be mistaken by an enemy for a real tank or used for training purposes. Dummy tanks emerged soon after the introduction of real tanks in World War I, but were not widely used until World War II.
During World War I, Allied forces made use of dummy versions of the British heavy tanks. These were constructed from a wooden framework and covered with painted Hessian cloth. The tracks were non-functional so some were fitted with concealed wheels underneath and were towed from place to place by a pair of horses. Dummy tanks, representing Allied models, were also found to have been constructed by the Germans, even though they deployed only a small number of real tanks. It is possible they were used in training, rather than for military deception.
Dummy tanks saw significantly more use during World War II by both the Allies and the Axis. German forces utilized mock tanks prior to the start of the war for practice and training exercises. Their use in military deception was pioneered by British forces, who termed them "spoofs."
One of the first uses of dummy tanks during the Second World War was in the North African Campaign. The Royal Engineers stationed there constructed two per day; between April and June 1941, they were able to build three dummy Royal Tank Regiments, and another in November that same year. These were foldable, and thus portable; and the Royal Engineers improved them further. Jeeps were used to make the "spoofs" more realistic: a steel frame covered with canvas was placed on them, making a self-propelled dummy tank. The Jeep did not realistically simulate the noise or movement of a tank, but allowed the dummy to be deployed quickly. Meanwhile, the reverse was also done, to make tanks look like trucks. A further device was put into use that both created simulated tank tracks and erased real ones.