 Kọkọ parí gbólóhùn yìí: Nígbà tí Ogun Àgbáyé Kìíní bẹrẹ, Archduke Franz Ferdid ti ilẹ Austria ló kú : Ti pa, pẹlu iyawo rẹ Sophie, Duchess of Hohenberg ni Sarajevo ni 28 Okudu 1914 nipasẹ Gavrilo Princip, ara Bosnia ati ti o sọ ara rẹ ni Yugoslav, ati ọmọ ẹgbẹ ti Young Bosnia. Eyi ni a tẹle nipasẹ awọn rogbodiyan Anti-Serb ni Sarajevo, eyiti o fa iku meji ati iparun ohun-ini. 