Ka cika wannan magana: Ba da daɗewa ba bayan da Izso ta bar gidan wasan opera, sai Yaƙin Duniya na Ɗaya ya ɓarke. Bayan da aka kashe Archduke Franz Ferdinand na Austria, Austria-Hungary ta yi yaƙi wata ɗaya bayan haka kuma ta shiga Serbia. Izso ya kama shi cikin saurin tattarawa kuma ya yi aiki a matsayin firist a cikin sojojin Austro-Hungary. Ya kasance mai aiki na tsawon watanni takwas, amma ya ji rauni sosai a kafa ta wani ɓangaren harsashi na Italiyanci a lokacin yakin basasa.
Yaƙin farko na Isonzo a 1915. Daga baya ya warke, amma bai dawo hidimar ba.