In the 1930s, B.H. Liddell Hart, Giffard Le Quesne Martel, and John F.C. Fuller wrote extensively about the future of mobile warfare. Martel was considered one of the world’s leading tank experts of the 1930s. He went so far to prove his case that he built a light tank in his own garden, at his own expense, which became the platform for the British Bren gun-carrier.