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. A sakamakon haka, birnin ya kasance
Luftwaffe ta yi ruwan bama-bamai a ranar 6 ga Afrilu, 1941, inda ta kashe mutane 2,274. Sai sojojin Jamus, Italiya, Hungary, da Bulgaria suka mamaye Yugoslavia. An kama Belgrade ta hanyar dabara, tare da sojojin Jamus shida da jami'in su Fritz Klingenberg ya jagoranci suna nuna girman barazanar, wanda ya tilasta birnin ya mika wuya. Belgrade ta mamaye kai tsaye daga Sojojin Jamus a cikin wannan watan kuma ta zama mazaunin mulkin marigayi Nedić, wanda janar din ya jagoranta. Wasu sassan yau na Belgrade an haɗa su cikin Independentasar Croatia mai zaman kanta a cikin Yugoslavia da aka mamaye, wata ƙasa ce ta marigayi, inda gwamnatin Ustashe ta aiwatar da kisan kare dangi na Serbs.