Rubuta ci gaba ga wannan sakin layi - A lokacin 1939<unk>1944 Nazi<unk>Soviet mamaye Poland
a lokacin Yaƙin Duniya na II, Grzegorczyk ya kasance memba na son rai na Sojojin Gida, babban motsi na adawa na Poland da aka kafa a watan Fabrairun 1942 ta Union of Armed Struggle da sauran 'yan adawa na Poland tare da biyayya ga Gwamnatin Poland-in-Exile a matsayin reshe mai dauke da makamai na Jihar karkashin kasa ta Poland. A matsayin mai tayar da kayar baya na Warsaw karkashin sunan "Bułka", ya ba da sabis na soja na son rai a matsayin mai harbi a cikin 2nd Platoon na Kamfanin '"Harcerska"' na AK Battalion 'Gustaw' na "'Róg"' Group na Group "'Północ"' na Home Army. Sakamakon Sonderkraftfahrzeug 301 Ausführung C Schwerer Ladungsträger Borgward B IV na Panzer Abteilung (Funklenk) 302 a ranar 13 ga Agusta 1944 a titin Jan Kiliński a cikin Old Town na Warsaw, wanda ya kashe rayukan 'yan adawa da fararen hula fiye da 300 na Poland, ya ji rauni a kafafu kuma an sanya shi a asibitin filin. Bayan kwanaki da yawa sai ya sake komawa cikin rukunin, amma saboda yanayin lafiya bai shiga cikin ƙarin fadace-fadace ba kuma an tilasta masa barin Warsaw a ranar 31 ga Agusta 1944 a matsayin farar hula a cikin kwashewa ta hanyoyin birni daga Tsohon garin Warsaw zuwa Warsaw Śródmieście.