Kammala jumla mai zuwa: Kashe Archduke Franz Ferdinand na Austria a ranar 28 ga Yuni 1914 a Sarajevo ta hannun Gavrilo Princip, memba na kungiyar Young Bosnia, ya sa Austria-Hungary ta ayyana yaƙi da Serbia, a ranar 28 ga Yuli 1914. Yaƙin na cikin gida ya ƙaru sa'ad da Jamus ta yi yaƙi da Rasha kuma ta mamaye Faransa da Belgium, ta haka ta jawo Biritaniya cikin yaƙin da ya zama Yaƙin Duniya na ɗaya. Serbia ta lashe manyan manyan yaƙe-yaƙe na Yaƙin Duniya na ɗaya, gami da Yaƙin Cer, da kuma
Yaƙin Kolubara, wanda ke nuna nasarar farko ta Allied a kan Tsakiyar Tsakiya a yakin duniya na farko.