Germany introduced more powerful anti-tank guns, some which had been in the early stages of development prior to the war. By late 1942, the Germans had an excellent 50-mm high-velocity design, while they faced the QF 6-pounder introduced in the North African Campaign by the British Army, and later adopted by the US Army. By 1943 Wehrmacht was forced to adopt still larger calibers on the Eastern Front, the 75 mm and the famous 88 mm guns. The Red Army used a variety of 45 mm, 57 mm, and 100 mm guns, as well as deploying general-purpose 76.2 mm and 122-mm guns in the anti-tank role. For the Invasion of Normandy, the British produced the 3-inch (76.2 mm) calibre QF 17 pounder, whose design had begun before the 6 pounder entered service, which proved to be a highly effective anti-tank gun and was also used on the tank and the tank destroyer.