Photograph of an American tank in 1917. Note the interesting triple tracks as well as the side windows for shooting and for navigation, which are protected by a metal flap. The main armament is a small gun located in a top turret. Also interesting is the height of this beast: it is nearly twice the height of the soldiers, which would have given it a high and therefore unstable center of gravity as well as making it harder to find cover behind natural terrain.
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