Diplodocus Militaris, to get across WW1 era trench warfare and barbwire defenses, the 1915 Boirault engine was considered the interesting ancestor of the tank

don't waste time at 1x speed, change the settings and see it at 2x speed, trust me

https://images.cnrs.fr/video/6672?fbclid=IwAR1XO0Sc804K9mDCqq7mZGwb3jqFCniba625QoG7qXghlQizv8A19MWrLN8

Ultimately, the machine was deemed impractical and was nicknamed Diplodocus Militaris. It preceded the design and development of the English Little Willie tank by six months.