Mezue ahịrịokwu na-esonụ: N'agha a, e lere mmeri Serbia anya dị ka ihe na-agaghị ekwe omume, ma ọ dịghị ihe ọzọ site n'aka ndị na-ekiri ihe na-emenụ, ma e jiri ya tụnyere ike nke Austria-Hungary. Otú ọ dị, Serbia akwadebewo nke ọma, na mgbe usoro nke agha na 1914 (Battle of Cer,
Agha nke Kolubara), ọnwụ na iweghachite Belgrade, na mwakpo nke ndị Serbia na-arụ ọrụ nke ụfọdụ mpaghara Austria nwere ọnụ ọgụgụ ndị Serbia buru ibu (na Syrmia na ọwụwa anyanwụ Bosnia), ndị agha Austro-Hungarian kwụsịrị. Na July 5, 1914, ihe gbanwere ka Eze Peter nke Mbụ hapụrụ ọrụ ya nye onye nketa Alexander, na-eme ya onye na-achị achị.