Dilkii Archduke Franz Ferdinand ee Awstaria, wuxuu ku kalsoon yahay calanka Australiya iyo Macalinka, iyo xaaskiisa Sophie, Duchess of Hohenberg, wuxuu dhacay 28kii Juun 1914 magaalada Sarajevo markii ay si xun u dhaawacmeen Gavrilo Princip. Mabaadi'du waxay ka mid ahayd lix kooxood oo ka mid ah lix askari (shan Serbeeb iyo mid Bosniak) oo ay isku duubnaayeen Danilo Ilić, oo ah sarkaal Bosnian ah iyo xubin ka tirsan bulshada qarsoodiga ah ee gacanta. Ujeedada siyaasadeed ee dilka ayaa ahayd in la jebiyo gobollada Kuuriyada Koonfureed ee Austria-Hungary, si ay ugu biiraan Yugoslavia. Ujeeddooyinka dilalka ayaa la jaanqaaday dhaqdhaqaaqa oo markii dambe loo yaqaan "Young Bosnia. Dilka ayaa si toos ah u horseeday Dagaalkii koowaad ee aduunka markii Austria-Hungary ay markii dambe soo saartay boqortooyada Serbia, taas oo qayb ahaan loo diiday. Austria-Hungary waxay markaa ku dhawaaqday dagaal, tallaabooyin isdabajoog ah oo u horseedaya dagaal u dhaxeeya inta badan dalalka yurub. Mas'uuliyiin ka tirsan qabaa'ilada Serbian ah ayaa ahaa madaxa sirdoonka milatariga Serbian Dragutin Dimitrijević, ninkiisa midig ee Major Vojislav Tankosić, iyo jeelka Rade Malobabić. Tankosić waxay dileen asluubta bamamka iyo bistoolado waxayna tababareen.