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The 15cm sIG33 (SF) auf Panzerkampfwagen 1 Ausf.B was a German self-propelled heavy infantry gun used during World War 2. Assigned to the infantry gun companies of the motorized infantry regiments had difficulties keeping up with the tanks during combat. The easiest solution was to modify a spare tank chassis to carry it into battle. A sIG 33 was mounted on the chassis of a Panzer 1 Ausf.B, complete with carriage and wheels, in place of the turret and superstructure.