In January 1917, engineer Louis Boirault proposed an articulated tank, a vehicle that would be long enough to cross wide trenches and yet sufficiently flexible to maintain mobility.
V januári 1917 inžinier Louis Boirault navrhol kĺbový tank; vozidlo, ktoré by bolo dostatočne dlhé aby prekročilo široké zákopy a dostatočne flexibilné, aby si zachovalo mobilitu.