Mezue ahịrịokwu na-esonụ: N'oge a, ọjụjụ Yugoslavia jụrụ isonyere ogige Axis kpasuru Hitler iwe. Gọọmentị Yugoslavia n'okpuru Regent Prince Paul bụbu onye na-akwado isonye na Germany. Ma otu "nchịkwa ọchịchị" kwaturu ọchịchị ahụ, chụtuo Onyeisi, ma mee nwa okorobịa ahụ dị afọ iri na ụma bụ́ Peter nke Abụọ eze. N'ịzaghachi nke a, Hitler nyere iwu ka a wakpo Yugoslavia, "Operation Punishment" ("Strafgericht"). N'oge
bọmbụ nke Belgrade, e bibiri etiti nke isi obodo Yugoslavia na 15,000 ndị mmadụ gburu ma na-enweghị ebe obibi. Bọmbụ ahụ bidoro n'ụbọchị isii nke ọnwa Eprel ma gaa n'ihu ruo ụbọchị anọ ruo ụbọchị iri nke ọnwa Eprel.