Kammala jumla mai zuwa: A lokacin Yaƙin Duniya na II, sojojin Jamus sun mamaye Włocławek, waɗanda suka shiga garin a ranar 14 ga Satumba, 1939. A karkashin
Nazi Jamus Włocławek an sake canza sunan Leslau, wanda aka haɗa shi da dokar Reich ta Jamus a ranar 8 ga Oktoba 1939 kuma an gudanar da shi daga 26 ga Oktoba a matsayin wani ɓangare na Reichsgau Posen (wanda aka sake masa suna a ranar 29 ga Janairu 1940 Reichsgau Wartheland).