Churchill tank
The weapon was effective against almost every Allied tank until the end of the war, only struggling to penetrate heavier vehicles like the Russian IS tanks, the American M4A3E2 Sherman 'Jumbo' and M26 Pershing, and later variants of the British Churchill tank. The Pak 40 was much heavier than the Pak 38; its decreased mobility meant that it was difficult or even impossible to move without an artillery tractor on boggy ground.