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A key requirement of the original specification was that the aircraft be powered by engines that were not in demand for other designs. Prototypes with low-power German Argus As 410 engines of 465 PS (459 hp; 342 kW) failed acceptance test, a more powerful replacement was found with the French Gnome-Rhône 14M engine of 700 PS (690 hp; 515 kW).
The design was relatively effective when it was first introduced, and saw service on the Eastern Front in a variety of front-line roles. As the war continued and anti-tank support became the main goal, the aircraft was continually up-gunned, eventually mounting a 75 mm anti-tank gun. Only a small number of these B-3 models were produced, late in the war.