Mezue ahịrịokwu na-esonụ: Mgbe Nazi Germany chịkọtasịrị Austria na 1938, Yugoslavia sooro Reich nke Atọ kewaa ókèala ma nọrọ n'okpuru nrụgide na-arịwanye elu ka ndị agbata obi ya na-esonyere ike Axis. N'April 1939, Yugoslavia nwetara ókèala nke abụọ ya na Ịtali mgbe mba ahụ
wakporo ma weghara mba Albania dị ha nso. Mgbe Agha Ụwa nke Abụọ tiwapụrụ, gọọmenti Yugoslavia kwupụtara nnọpụiche ya. N'agbata September na November 1940, Hungary na Romania sonyeere Axis, Ịtali sikwa Albania wakpo Gris. Site n'oge ahụ gaa n'ihu, ọ fọrọ nke nta ka ọ bụrụ na mba ndị so n'Òtù Axis na ndị ha na ha na-emekọ ihe gbara Yugoslavia gburugburu kpamkpam, nnọpụiche ya n'agha ahụ bịakwara ná nrụgide kpụ ọkụ n'ọnụ. Ná ngwụsị February 1941, Bulgaria sonyeere Axis. N'echi ya, ndị agha Germany si Romania banye Bulgaria, na-emechi ihe fọrọ nke nta ka ọ bụrụ Yugoslavia. N'ebumnuche nke ime ka akụkụ ndịda ya dị nchebe tupu mwakpo a na-aga ịwakpo Soviet Union, Adolf Hitler malitere itinye Yugoslavia n'oké nrụgide isonyere ike Axis. Gọọmentị Yugoslav bịanyere aka na nkwekọrịta atọ ahụ, nke bụ ihe mejupụtara Axis, mgbe oge ụfọdụ gachara, na 25 Machị 1941. Ụbọchị abụọ ka e mesịrị, otu ìgwè ndị ọrụ ụgbọelu nke ndị mba Serbia na-akwado ọdịda anyanwụ wepụrụ Prince Paul n'ọchịchị na-enweghị ọbara. Ndị na-agba izu ahụ kwupụtara na Prince Peter dị afọ iri na asaa tozuru oke ma weta gọọmentị nke ịdị n'otu mba nke General Dušan Simović duziri. Ọgbaghara ahụ kpasuru Hitler iwe, onye nyere iwu mbuso agha nke Yugoslavia nke malitere na 6 Eprel 1941.