Combat History
For combat trials the two prototypes were assigned to Panzerjäger Abteilung ("Anti-tank Battalion") 521 during the invasion of the Soviet Union. One caught fire by accident and was completely destroyed by the detonation of its ammunition, but the other fought successfully until the end of 1941. It was rebuilt by Krupp during the first half of 1942 and returned to the 521st in time to participate in Case Blue, the 1942 summer offensive in Russia. It was not reported operational in reports made by the battalion in November—December 1942.
A report of 26 July 1941 commented on the vehicle: "This Sfl. (self-propelled vehicle) is not sufficiently maneuverable for employment in a Vorausabteilung (lead unit). The limited traverse makes it necessary to turn the entire vehicle to aim at targets. This takes considerable time when done repeatedly, especially off-road because of the heavy vehicle and weak engine. In addition, because of its armor layout - only thick in the front and 50 mm lower in the back - it was built for frontal use. The vehicle can be shot into from the side and rear. Employment in a Vorausabteilung requires the ability to quickly engage targets in every direction.
The gun has proven itself capable of supporting an infantry attack from an open firing position by direct fire as in the Szczarar crossing. It is not possible to observe our own shots because of large dust clouds raised in front of the gun. The Sfl. must alternatively observe each other's fire or an observation post must be established off to one side, manned by a Richtkreis-Uffiz. (gunner) familiar with the crew. Because of its size, lack of mobility, and large dust cloud raised when firing, in the future the Sfl. will only shoot Sprenggranaten (HE) by indirect fire.
Up to now, the Sfl. has been employed in its specialized tasks - engaging concrete bunkers by direct fire and engaging heavy tanks in coordination with other Panzerabwehrwaffen (anti-tank weapons). Its high penetration ability appears to be suitable for this.
No specific problems have occurred with the engine or transmission. The steering brakes are overstressed. Bolts in the steering slide of one steering brake have torn out three times and the brake bands have had to be changed twice because the rivets were over-heated."
Read more about this topic: 10.5 Cm K (gp.Sfl.)
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