WW2 German SP Artillery Sig 33

With the borders of the third reich growing larger and larger and the Pzkw I becoming more obsolete by the day, The Germans literally removed the turret from the panzer 1 built a quick shield to protect gunners and literally rolled a SIG33 Infantry Gun up on the chassis, secured it to the top of the chassis and there they had their first Self Propelled Artillery, while there would be others, many others this was the first look at true German engineering on the fly as it were, The first appeared in 1940 and were still in production in 1944