Dee ihe na-aga n'ihu maka paragraf a - Ndị ọkà mmụta ekwuola ọtụtụ echiche maka ọdịda mberede nke Royal Yugoslav Army, gụnyere ọzụzụ na akụrụngwa na-adịghị mma, ndị ọchịagha na-achọsi ike iji nweta nkwụsị ngwa ngwa nke ọgụ, 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. N'agbanyeghị na Ịtali na-alụso Gris agha,
na 28 Ọktoba 1940, na mwakpo ndị Germany na Gris (Operation "Marita") na mwakpo nke Crete (Operation "Merkur"), mwakpo nke Yugoslavia bụ akụkụ nke German Balkan Campaign ().