Due to a demand for more assault guns, the StuG IV was formed from a combination of a slightly modified Sturmgeschütz III assault gun superstructure with a Panzerkampfwagen IV chassis. Starting from December 1943, around 1,100 were built by Krupp. As Krupp didn't build Panzerkampfwagen III's, they used the Panzerkampfwagen IV hull.
The StuG IV became known as a very effective tank killer, especially on the Eastern Front.
It had a 4 man crew, and was issued mainly to infantry divisions.
Learn more at Wikipedia and (image courtesy of ) Achtung Panzer
