Kammala wannan jumla: A ranar 1 ga Satumba 1939 sojojin Jamus sun mamaye Poland. III./KG 3 sun kai hari kan matsayin Poland da ke kare gadar Tczew. Duk da harin, da kuma wani daga StG 1, 'yan Poland sun gyara wayoyin kuma sun busa gada bayan sa'o'i biyu. Dukkanin "Gruppen" sun shiga cikin Yaƙin Grudziądz. Sun shiga cikin ayyukan Narew, Praha. KG 3, tare da KG 27 a karkashin Wimmer, sun tura kudu daga 6 ga Satumba don ware Warsaw daga gabas. Sun goyi bayan ci gaba a kan Warsaw da kuma kewayewa. Dukkanin kungiyoyin biyu sun kai hare-hare a yankin.
Yaƙin Modlin. Ba a san asarar KG 3 ba, amma II./KG 3 ya rasa dan bama-bamai a cikin fashewar iska saboda fashewar fuse; tare da III./KG 4, da I./KG 152 daga 3 zuwa 6 Satumba 1939. KG 3 ta yi ruwan bama-bamai a kusa da Płock, Lida da Biała Podlaska. Dukkanin kungiyoyin biyu sun halarci Yakin Bzura da lalata Sojojin Poznań da Sojojin Pomorze.