Wax yar ka dib markii Izso uu ka tagay opera-da, dagaalkii koowaad ee aduunka ayaa qarxay. Kadib markii Archduke Franz Ferdinand ee Austria la dilay, Austria-Hungary waxay ku dhawaaqday dagaal bil kadib waxayna u ambabaxday Serbia. Izso waxaa ku qabsaday abaabulka degdegga ah wuxuuna u adeegay sidii wadaad ciidanka Austro-Hungarian. Wuxuu ahaa mid firfircoon muddo sideed bilood ah, laakiin wuxuu si xun ugu dhaawacmay lugta burburka madaafiicda Talyaaniga intii lagu jiray Dagaalkii Koowaad ee Isonzo
sanadkii 1915kii Markii danbe wuu bogsaday, laakiin dib uma soo laaban waqtigii loogu talagalay.