The Sturmpanzer II Bison was a self-propelled gun, consisting of a 150 mm sIG 33 heavy infantry gun mounted on top of a Panzer I chassis, together with a lightly armoured casemate to protect the gun servants. It was stop-gap vehicle used as an infantry support vehicle and showed its limits during the invasion of France and the Low Countries. The weight of the gun and the additional armour strongly hindered the mobility of the tank and caused premature mechanical wear. The gun installed very high on the chassis together with the casemate made the Sturmpanzer I a target of choice on the battlefield due to its very tall silhouette. The casemate did not protect all gun servants: the gunner and the commander were protected but loaders were extremely exposed as the casemate wasn't designed long enough to cover the rear of the vehicle. The extremely cramped layout of the vehicle made it impossible to stow ammunition: it had to be brought by a separate dedicated tank.

The need for the Sturmpanzer II was born early in 1941 when Rommel requested self-propelled guns to support his armoured divisions in North Africa. This led the German Army to consider mounting the heavy gun sIG 33 on a vehicle chassis more fit to the task. The requirements for the new vehicle were to provide a less cramped layout for the gun and the crew to operate in optimal conditions, to give a silhouette as small as possible and to carry its own ammunition onboard, while maintaining the crew count, operational range and top speed of the previous Sturmpanzer. The Sturmpanzer II served in North Africa, in the German 707th and 708th Heavy Infantry Gun Companies Heavy Infantry Gun Company until their destruction or surrender in 1943

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Controls:
1:Headlights
2:Hatch
3-7:none
8:Engine