Mezue ahịrịokwu na-esonụ: Ndị ọkà mmụta ekwuola ọtụtụ ihe kpatara ọdịda mberede nke Royal Yugoslav Army, gụnyere ọzụzụ na akụrụngwa na-adịghị mma, ndị ọchịagha na-achọsi ike iji hụ na ha kwụsịrị ọgụ ngwa ngwa, na nnukwu ndị mba Croatia nke ise. Mwakpo ahụ kwụsịrị mgbe a bịanyere aka na nkwekọrịta agha na 17 Eprel 1941, dabere na ntinye aka nke ndị agha Yugoslav, nke malitere ịdị irè n'etiti ehihie na 18 Eprel. Mgbe ahụ, ike ndị Axis weghaara Yugoslavia ma kewaa ya. Obodo ụfọdụ nke Yugoslavia bụ ndị mba Axis gbara agbata obi jikọtara, ụfọdụ mpaghara ka nọ na-arụ ọrụ, na mpaghara ndị ọzọ, steeti Axis dị ka Independent State of Croatia (NDH) ka e kere n'oge mbuso agha na 10 Eprel. Tinyere nke Italy
mbuso agha nke Gris na 28 Ọktọba 1940, na mbuso agha nke ndị Germany na-eduzi Gris (Operation "Marita") na mbuso agha nke Crete (Operation "Merkur"), mbuso agha nke Yugoslavia bụ akụkụ nke German Balkan Campaign ().