Tuhia he haere tonu mo tenei whitianga - I arahi a Pétain i tana parirau i te Pakanga o Guise (29 Akuhata 1914). I te mutunga o Akuhata 1914 i tere whakatairangahia ia ki te brigadier-general ka whakawhiwhia ki te whakahau o te 6th Division i te wa mo te Pakanga Tuatahi o te Marne; neke atu i te marama i muri mai, i te Oketopa 1914, ka whakatairangahia ano ia ka noho hei rangatira o te XXXIII Corps. I muri i tana arahi i tana roopu i te puna o te tau 1915 Artois Offensive, i te Hurae 1915 i whakawhiwhia ki a ia te mana o te Ope Tuarua, i arahina e ia i te whakaeke a Champagne
i taua ngahuru. I riro i a ia te ingoa ko ia tetahi o nga rangatira angitu i te Hauauru Hauauru.