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The Bison was the the third and last version of the self-propelled sIG33, using the chassis of the PzKpfw 38(t). The first version was armed with a 150mm sIG 33 L/12 which was placed on the front of the vehicle. This turned out to be instable, and after 90 vehicles of Ausf. H were built, an improved version was produced. Designated sIG33/1 on Selbstfahrlafette 38(t) Ausf. M, it had a rear-located fighting compartment. In total 370 vehicles were built before production ceased in september 1944. 
150mm s.I.G. 33 L/11 SdKfz 138/1 Bison Ausf. M
 sIG 33 on PzKpfw 38(t) Ausf. H
The medium batteries had to wait until 1943 for the successful Hummel (Bumble Bee) 150mm 18 L/30 self-propelled howitzer, which was built on the same PzKpfw IV chassis as the Nashorn. Of this vehicle 666 were built in 1943-44 and the Hummel remained in service till the end of the war. Another 150 unarmed vehicles were produced as munition carrier.
Early Hummel model with small driver compartment
A dark yellow Hummel missing its camouflage pattern
The terrible battle fought in Stalingrad resulted in the production of vehicles which were purpose-built for street-fighting or the reduction of fortifications. Although none were completed in time to fight in Stalingrad, one of the most successful armored vehicles that resulted from this consideration was the Sturmpanzer IV Brummbär (grizzly bear) assault howitzer, based on the PzKpfw IV chassis. This vehicle possessed 100mm frontal armor and was armed with a 150mm L/12 howitzer, giving it a heavy punch. The shells had a weight of 38 kg, enough to destroy the stronguest fortification. 
A Brummbär of a Sturmpanzer-Abt in Italy
Late production Sturmpanzer IV Brummbär
Brummbärs were built on Panzer IV Ausf. F through J chassis. Early versions had a Tiger visor for the driver, and a short collar on gun. Later versions, on Ausf. H and J chassis, had periscopes for the driver, longer collar on gun, and different roof layout. Finally a machine-gun in ball mount was added in the front for self-defence. The Brummbärs began reaching the front in April 1943, serving in the heavy infantry gun companies of Panzergrenadier regiments or assault battalions. More than 300 vehicles were produced.
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