Night Witches
After the mid 1942 successes of Operation Barbarossa, Soviet VVS nocturnal harassment bomber units such as the Night Witches, used obsolete Polikarpov Po-2 biplanes against the invading Germans. The Luftwaffe began to set up their own nocturnal harassment Staffel-sized forces known as "Störkampfstaffeln". Eventually "Gruppe"-sized "Nachtschlachtgruppen" were used for the same general purpose as the Soviet units. The Luftwaffe's own harassment aviation units also used similarly obsolete aircraft, but of German design. The Heinkel He 46, Arado Ar 66, Focke-Wulf Fw 56 and even the standard training biplane, the Gotha Go 145, were all deployed in their efforts at attempting to emulate the success of the Soviets.