Ka kammala wannan jumla: A lokacin mamayewar Poland, wanda ya fara Yaƙin Duniya na II, a shekara ta 1939 ne Tarayyar Soviet ta fara kama garin a ranar 24 ga Satumba, 1939. An yi wa Sejny fashi sosai sannan a ranar 13 ga Oktoba 1939 aka tura shi zuwa Nazi Jamus. Ya kasance
Jamus ta mamaye shi har zuwa watan Agusta 1944.