The Sd.Kfz.101 Flakpanzer I was modified from Panzer I Ausf.A tanks by removing the gun turret and installing a single-barreled 2cm FlaK 38 gun. The engine deck and hull were also modified. 24 Flakpanzer I were produced, and were assigned to Fla.Bataillon 614(mot) in May 1941, til the end of the Battle of Stalingrad in 1943.