Rubuta ci gaba ga wannan sakin layi - Ba da daɗewa ba bayan Izso ya bar wasan opera, 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 yi aiki na tsawon watanni takwas, amma ya ji rauni sosai a kafa ta wani ɓangaren harsashi na Italiyanci a lokacin yakin farko na Isonzo.
a shekara ta 1915. Daga baya ya warke, amma bai dawo hidimar ba.