Airfix Sherman " Crab" Tank (A02320) To support the infantry through the minefields on the ground operation in Europe & the Pacific, US military engineers decided to modify their new tank, the M4 Sherman, which was not only used by US forces, but also by the British, Canadian & Free French forces. Chains attached to a cylinder on the front of the Sherman made contact with anti-personal or anti-tank mines, triggering the explosion which would not destroy any part of the Sherman tank.