a turret. Self-propelled artillery Wespe 105 mm howitzer built on Panzer II chassis Grille 150 mm heavy infantry gun built on Panzer 38(t) chassis, sometimes wrongly named "Bison" Hummel The Hummel was a self-propelled artillery piece fielding a 150 mm howitzer on a chassis that combined features of both the Panzer III and Panzer IV. 714 Hummels plus 150 Hummel ammunition carriers were built from 1943 to 1944. Heuschrecke The Heuschrecke was a self-propelled artillery piece with a 10.5cm leFH 18/1 L/28 on a Panzer IV chassis. Production never started as it would have affected production of tanks. Self-propelled anti-aircraft artillery Several types of armored self-propelled anti-aircraft weapons ("flakpanzers" in German) were used in the war. Flakpanzer I, a converted version of the, Panzer I tank. Flakpanzer 38(t), based on the Panzer 38(t) light tank Flakpanzer IV, the general designation for a series of vehicles based on the Panzerkampfwagen IV medium tank chassis, including the: Möbelwagen Wirbelwind Ostwind Kugelblitz, in prototype stage at the end of World War II Assault guns An assault gun is an armoured fighting vehicle similar to a tank, but typically does not have a rotating turret, and may have an open roof. The removal of the turret allows for a much larger gun to be carried on a smaller chassis. They are not intended to fight other AFVs, but instead directly support infantry during assaults on prepared positions. However they were still often fitted with AT guns to destroy AFVs. During World War II Germany built many more assault guns than tanks, because of their relative cheapness and simplicity. Sturmgeschütz III built on the Panzer III chassis Sturmgeschütz IV built on the Panzer IV chassis with 75 mm gun Sturmpanzer IV ("Brummbär") with 150 mm gun built on the Panzer IV chassis Sturmtiger built on repaired Tiger I chassis, 380 mm rocket projector Tank destroyers Panzerjäger I built on the Panzer I chassis Jagdpanzer 38 built on modified Panzer 38(t) chassis Jagdpanzer IV built on the Panzer IV chassis Jagdpanther built on the Panzer V chassis Marder I built on chassis of captured French and some Polish tanks Marder II built on the Panzer II chassis Marder III built on the Panzer 38(t) chassis Nashorn Jagdtiger based on the Tiger II Elefant The Elefant (Sd. Kfz. 184) used the chassis of Porsche's losing entry for the Tiger I competition. On top of this chassis, a