Kammala wannan jumla: mamayewar Jamus ta Yugoslavia ta fara ne a ranar 6 ga Afrilu 1941 tare da yin ruwan bama-bamai mai yawa, musamman na Belgrade (
Operation "Retribution") da aka yi amfani da shi. A cikin yunƙurin banza don dakatar da sojojin Jamus masu tasowa, Rundunar Sojojin Sarauta ta Yugoslav ta yanke shawarar rushe dukkan gadoji uku da ke cikin Belgrade a wancan lokacin (wasu biyun sune Tsohon Gidan Jirgin Ruwa da Gadar Sarki Peter II). An umurci kwamandan soja na Belgrade, janar Vojislav Nikolajević, da ya rushe su, kuma Manjo Velimir Piletić ne ya zartar da umarnin don gadar Sarki Alexander. An yi amfani da gada tare da fashewa a ranar 11 ga Afrilu, 1941. An busa shi a cikin dare kuma ya fita daga sabis amma ban da kasa dakatar da sojojin mamayewa, rushewar kai tsaye ya haifar da mummunan hatsari. Yayin da Sojojin Masarautar ke cikin rikici, sun busa gadar yayin da jirgin ruwan "Tanasko Rajić" ke jan jirgin jigilar sojoji "Korana" tare da sojojin Yugoslavia, suna jigilar su zuwa matsayin ajiyar a ƙauyen Ostružnica, da ke Kogin Sava. Ba tare da ganin jiragen ruwa a cikin duhu ba, injiniyoyin soja sun busa gada kuma ginin ya fadi kai tsaye a kan jiragen ruwa, ya kashe 95 daga cikin sojoji 110 da ma'aikatan jirgin.