Rubuta ci gaba don wannan sakin layi - A lokacin yakin duniya na II, Nazi na Nazi, Fort VII ya zama sananne a matsayin sansanin Nazi, inda har zuwa 'yan Poland 20,000 suka mutu. Tsakanin 1940 da 1945, Fort Grolman da Fort Rauch sun kasance ainihin sansanin POW na Stalag XXI-D. A ƙarshen yaƙin an ayyana Poznań a matsayin ɗayan biranen da ke da ƙarfi ("Festungen") waɗanda Nazis ke niyyar karewa a kowane farashi, don haka aka sake sunan "Festung Posen". An yi amfani da sansanonin waje don kare birnin a lokacin yakin Poznań (1945)
, da kuma Fort Winiary shi ne maki na karshe na masu karewa, wanda ya haifar da mummunar lalacewa. Bayan yakin an canza wurin Fort Winiary zuwa filin shakatawa na Cytadela.