Kammala jumla mai zuwa: A ranar 25 ga Maris, 1941, gwamnatin mai jiran gado Yarima Paul ta rattaba hannu kan Yarjejeniyar Tripartite, tare da shiga cikin ikon Axis a kokarin da za su yi na guje wa yakin duniya na biyu da kuma kiyaye Yugoslavia tsaka tsaki a lokacin rikici. Nan da nan aka biyo bayan zanga-zangar jama'a a Belgrade da juyin mulkin soja wanda kwamandan Sojan Sama Janar Dušan Simović ya jagoranta, wanda ya ayyana Sarki Peter II ya zama mai shekaru don mulkin masarautar. Sakamakon haka, birnin ya kasance
Luftwaffe ta yi ruwan bama-bamai a ranar 6 ga Afrilu, 1941, lokacin da aka kashe mutane 24,000. Daga nan sai sojojin Jamus, Italiya, Hungary, da Bulgarian suka mamaye Yugoslavia, sojojin Jamus suka mamaye Belgrade a ranar 13 ga Afrilu 1941 kuma yankunan da ke gabashin gabas kamar Zemun, a cikin yankin babban birnin Belgrade, an haɗa su cikin jihar Nazi, Ƙasar Independent Croatia. Belgrade ya zama wurin zama na mulkin Nedić, wanda Janar Milan Nedić ya jagoranta.