What is sturmpanzerwagen oberschlesien?

Sturmpanzerwagen Oberschlesien was a German armored vehicle developed during World War II. The vehicle was designed to provide support for infantry during urban combat. It was based on a modified chassis of the Czech-designed Pz.Kpfw. 38(t) tank and was armed with a 150 mm sIG 33 howitzer. The vehicle had a crew of six and weighed around 16 tons. The Sturmpanzerwagen Oberschlesien was intended to be deployed in the Eastern Front. However, due to the demands of the war, only one prototype was produced and it was never used in combat. The prototype was captured by the Soviet Union during the war and its fate after that is unknown.