Dee ihe na-esote paragraf a - N'agha a, e lere mmeri Serbia anya dị ka ihe na-agaghị ekwe omume, ma ọ dịkarịa ala site n'aka ndị na-ekiri n'èzí, 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, Battle of Kolubara
), ọnwụ na iweghachite Belgrade, na mwakpo ndị Serbia na-arụ ọrụ nke ụfọdụ mpaghara Austria nwere ọnụ ọgụgụ dị ukwuu nke ndị Serbia (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.