The churchill was one of the most important British tanks in ww2 ( sherman does not count because those were under loan from the U.S.). It first had action in 1942 in Dieppe. After lessons learned there, the British upgraded the 40mm main gun to a 57mm and then a 75mm main gun taken from Sherman tanks. Its heavy armour and robust running gear helped it to survive even severe damage and rough terrain. By 1945, a grand total of 5460 Mk. IV tanks have been built. Weight: 44.8 tons; crew: 5, Dimensions: length: 297 in., width: 128 in; height: 98 in.; engine: Bedford twin-six, water cooled, 21,100 cc, 350 hp.; Power to weight ratio: 7.8hp/ton; Max. speed: 15 mph road, 8 mph cross- country; Armament: 1 3 in. gun, 2 .3 MG; armour: .7-5.9 in.