Tuhia he tomokanga mo tenei whitianga - I whakauruhia a Colley-Priest ki te 8th Field Ambulance, he waahanga o te 8th Infantry Brigade o te Australian Imperial Force, i te 19 o Mei 1915 ka eke ki runga i te HMAT Ascanius i te 9 o Noema, ka haere ki Ihipa me te Western Front. I a ia e mahi ana, i tukuna ia ki te Somme, Racquinghem, Poligon Wood, Messines, Villers-Bretonneux
me te maunga o Saint-Quentin. I te tau 1917, i whakawhiwhia a Colley-Priest ki te Tohu Hauora. Ko te taunakitanga mo te tohu i kii ko ia te whakaatu: