Kammala wannan jumla: A ranar 1 ga Satumba, 1939, ranar farko ta Yaƙin Duniya na II, Luftwaffe na Nazi na Jamus ya yi wa Żnin bam. Kwana tara bayan haka, sojojin Jamus suka shiga garin, wanda aka sake masa suna "Dietfurt" kuma ana gudanar da shi a cikin Landkreis Dietfurt (Wartheland). An sauya sunayen tituna da sunayen shugabannin Nazi ko kuma sunayen da suke kama da na Jamus. Babu makaranta ga 'yan Poland; yara dole su yi tafiya zuwa Góra, ƙauyen gabashin Żnin. An kori 'yan Poland 600, tare da 200 da aka kai aikin tilas ko sansanonin Nazi. A watan Nuwamba da Disamba na 1939, an harbe 'yan gudun hijirar, galibi' yan tawaye na 1919, a wurare daban-daban a kusa da garin. A lokacin da
A lokacin mulkin mallaka, 'yan Jamus sun kafa kuma sun gudanar da kurkukun Nazi a garin. Bayan yaƙin, a ranar 21 ga Oktoba, 1945, an sake yin jana'izar mutane 62 da aka binne a Gąsawa. A ƙauyen Góra (yanzu wani ɓangare na Żnin), an yi jana'izar Yahudawa 100 da aka kashe a sansanin fursunoni na Murczyn da ke kusa, kuma an buɗe wani abin tunawa da masu sana'a na Żnin suka yi a ranar 11 ga Disamba, 1987.