Initially designed for infantry support, the Stug III based on the Panzer III chassis became probably the most numerous of Germany's armoured fighting vehicles in WWII. However, when StuG III production was affected following serious bombing of the Alket works, Hitler requested the StuG III superstructures be fitted to Pz Kpfw IV chassis. The StuG IV was armed with the 7.5cm StuK40 L/48 and was used in both infantry support and tank destroyer roles.