Sturmgeschütz III was built on the chassis of a tank developed in Germany in what decade?
Sturmgeschütz III The Sturmgeschütz III (StuG III) assault gun was Germany's most-produced armoured fighting vehicle during World War II. It was built on the chassis of the proven Panzer III tank, replacing the turret with an armored, fixed superstructure mounting a more powerful gun. Initially intended as a mobile assault gun for direct-fire support for infantry, the StuG III was continually modified, and much like the later "Jagdpanzer", was widely employed as a tank destroyer.
Sturmgeschütz IV The Sturmgeschütz IV (StuG IV) (Sd.Kfz. 167), was a German assault gun variant of the Panzer IV used in the latter part of the Second World War. Identical in role and concept to the highly successful StuG III assault gun variant of the Panzer III, both StuG models were given an exclusively tank destroyer role in German formations and tactical planning in the last two years of the war, greatly augmenting the capability of the dwindling tank force available to the German army on the Eastern and Western fronts.