They lacked the 75mm howitzer in the hull , and were used on the Eastern Front in Operation Barbarossa .
Self - propelled artillery , armed with the 10.5 cm leFH 18 light howitzer ; Sixteen converted by Rheinmetall - Borsig in 1942 .
Sixteen lacked the 75mm howitzer in the hull , and were used on the Eastern Front in Operation Barbarossa .
Self - propelled artillery , armed with the 10.5 cm leFH 18 light howitzer ; Sixteen converted by Rheinmetall - Borsig in 1942 .