Kammala wannan jumla: A lokacin yakin duniya na biyu, garin ya kasance a karkashin
Zamanin Jamus daga 5 ga Satumba, 1939 zuwa 22 ga Janairu, 1945, an sanya yankin a cikin Reichsgau Wartheland. An yi wa mutanen Poland laifuka daban-daban, gami da kisan kai, turawa zuwa sansanonin Nazi da kuma fitarwa. Mazaunan Margonin suna cikin 'yan Poland 41 da aka kashe a ƙauyen Morzewo da ke kusa a ranar 7 ga Nuwamba, 1939. A ranar 10 zuwa 12 ga Disamba, 1939, Jamusawa sun kori yawancin mazaunan Poland zuwa Gundumar Warsaw na Gwamnatin Janar a tsakiyar Poland da Jamus ta mamaye. Jamusawa sun gudanar da kurkukun Nazi a cikin garin da kuma sansanin aikin tilastawa ga Yahudawa. Ƙungiyar 'yan tawaye ta Poland ta kasance mai aiki a Margonin, kuma da yawa daga cikin mambobinta sun mutu a sansanin fursunoni, bayan da' yan Jamus suka gano ayyukansu. Bayan Yaƙin Duniya na II, yankin ya koma Poland.