四號坦克
On the Western Front, the American M4 Sherman's 75 mm M3 gun, had troubles facing the Panzer IV late model. Panzer IV late model's frontal hull armor could easily withstand hits from the 75  mm weapon on the Sherman at normal combat ranges. The British up-gunned the Sherman with their highly effective Ordnance QF 17-pounder gun, resulting in the Sherman Firefly, which was the only Allied tank capable of dealing with all German tanks, at normal combat ranges, in time for the Normandy landings. It was not until July 1944 that American Shermans fitted with the 76 mm gun M1 gun achieved parity in firepower with the Panzer IV.