Tamiya: 1/35 German Heavy Self-Propelled Howitzer Hummel Late ProductionCatch the Buzz! The Hummel was developed by German designers in short time, intended to provide a quick boost for troops that had begun to struggle in the aftermath of their invasion of the Soviet Union in 1941. Its chassis was a hybrid using parts from the Pz. Kpfw. III and IV, and the gun was the powerful sFH18 1 15cm piece that fired 43. 5kg howitzer rounds distances up to and over 13 kilometers. Hummels joined the fray from 1943 in the showdown