Tuhia he haere tonu mo tenei waahanga - I whakahau a General Prezan i te 4th Army Corps i te 1915-1916, a ka noho hei rangatira mo te Rōpū Tuawha o Romanian i te wa o te Romanian Campaign i muri mai i te tau 1916, ki nga ope o nga Central Powers. I arahi a Prezan i nga ope taua Romanian i te Pakanga o Bucharest
(Noema <unk> Hakihea 1916), a ka hoki mai aua ope ki te taha raki-rawhiti o Romania (Moldavia). I te Hōngongoi me Akuhata 1917, ko Prezan, i taua wa ko ia te Tumuaki o te Kaimahi Nui (me te awhina a te Kaihauturu-Karauna a Ion Antonescu) i angitu te aukati i te whakaekenga a Tiamana i arahina e Field Marshal August von Mackensen. I mahi tonu ia i tenei tuunga tae noa ki te 1920.