Whakaotihia te rerenga e whai ake nei: He tohu 1915 o te Royal Military College, Sandhurst, i whakawhiwhia a Dempsey hei tuarua tuarua i roto i te Royal Berkshire Regiment. I a ia he rangatira rangatahi, i whawhai ia i te Runga Hauauru i te Pakanga Tuatahi o te Ao, i whara ai ia, a i whakawhiwhia ki a ia te Karauna Hauora. I muri i te pakanga i mahi ia i Iraq i te wā o te
Ko te tutu o Iraki i te tau 1920, ko Iran i te Pakanga o Rūhia, me Inia.