On September 20 1942 the German military ordered 12 self-propelled artillery vehicles mounting the 15cm (5.91in) Sturminfanterie-geschütz (Assault Infantry Gun) L/11 howitzer and an MG34 mounted in the superstructure for defence to be made within 14 days. The initial 12 prototype versions that had been completed earlier in 1941 were refurbished and 12 more were made in October 1942. These vehicles were all based on the StuG III Ausf E and F/8 chassis and were officially designated the StuIG33B. They were intended to aid in the close-quarter fighting in and around Stalingrad. Models are unpainted and unassembled. Glue, paint, and other hobby supplies sold separately.