Mezue ahịrịokwu na-esonụ: N'ihi "Anschluss" nke 1938 n'etiti Germany na Austria, Yugoslavia bịara soro Reich nke Atọ nwee ókèala ma daa n'okpuru nrụgide na-arịwanye elu ka ndị agbata obi ya jikọtara onwe ha na ike Axis. N'April 1939, Ịtali mepere ókèala nke abụọ ya na Yugoslavia mgbe ọ
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 Nkwekọrịta Atọ ahụ, na-akwado ndị Axis, Ịtali wakporo 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-achị gbara Yugoslavia gburugburu kpamkpam, nnọpụiche ya n'agha ahụ bịakwara ka njọ. Ná ngwụsị February 1941, Bulgaria sonyeere Nkwekọrịta ahụ. N'echi ya, ndị agha Germany si Romania banye Bulgaria, na-emechi mgbanaka ahụ gbara Yugoslavia gburugburu. N'ịbụ onye bu n'uche ime ka akụkụ ndịda ya dị nchebe maka mwakpo na-eru nso megide Soviet Union, Adolf Hitler malitere itinye nrụgide siri ike na Yugoslavia iji sonyere Axis. Na 25 Machị 1941, mgbe oge ụfọdụ gachara, gọọmentị Yugoslav bịanyere aka na nkwekọrịta ahụ. Ụbọchị abụọ ka nke ahụ gasịrị, otu ndị agha nke Royal Yugoslav Army Air Force nke ndị mba Serbia na-akwado ọdịda anyanwụ, wepụrụ onye na-achị mba ahụ, Prince Paul, n'ọchịchị na-enweghị ọbara, tinye nwa nwanne ya nwoke dị afọ iri na ụma Peter n'ocheeze, ma weta "ọchịchị nke ịdị n'otu mba" nke General Dušan Simović duziri. Ọgba aghara ahụ kpasuru Hitler iwe, o nyekwara iwu ozugbo ka e buso mba ahụ agha. Mgbe e mere ngagharị iwe ahụ, Helm nọ na Berlin, Kraus nọkwa na Belgrade.