Kammala wannan jumla: A tsakiyar Maris 1941 III./KG 3 ya sauka ta Faransa zuwa Münchendorf, Austria kuma ya gudanar da horon horo daga 27 zuwa 29 Maris 1941. Kungiyar tana da Dorniers 28, tare da shirye-shiryen yaƙi 26 da Junkers Ju 88s uku. An sanya shi a karkashin umurnin Luftflotte 4 a karkashin umurnin Alexander Löhr har zuwa 5 ga Afrilu. Kungiyar ta goyi bayan mamayewar Yugoslavia, kuma ta shiga cikin
fashewar Belgrade a ranar 6 ga Afrilu. 102 Do 17s, dauke da 18 SC 50 kg (110 lb) fashewar bama-bamai, da kuma 2 AB 36 bama-bamai sun kai hari kan babban birnin. Wasu 82 Do 17s sun kasance masu aiki bayan rana ta farko, tare da asarar da aka ruwaito kawai, na'urar KG 3. Wata majiya ta ce biyu; duka daga 8 "staffel". Yaƙin ya ƙare a ranar 18 ga Afrilu, tare da saurin nasarar Axis.