Tuhia he whakamāramatanga mō tēnei wāhanga - Kāore i roa i muri i te wehenga atu o Izso i te opera, ka pakaru te Pakanga Tuatahi o te Ao. Whai muri i te kohurutanga o Archduke Franz Ferdinand o Austria, ka whakapuaki a Austria-Hungary i te pakanga kotahi marama i muri mai ka haere ki Serbia. I mau a Izso i te whakaoho tere, a, i mahi ia hei tohunga i roto i te ope Austro-Hungarian. E waru marama a ia e mahi ana, engari i whara kino ia i te waewae na te waahanga o te pupuhi a Itari i te Pakanga Tuatahi o te Isonzo
i te tau 1915. I te mutunga ka ora ia, engari kaore i te wa ki te hoki ki te mahi.