Rubuta ci gaba don wannan sakin layi - A lokacin da aka fara yakin duniya na farko, Patey ya jagoranci rundunar sojan ruwa na Australia a matsayin wani ɓangare na New Zealand Samoa Expeditionary Force wanda ya kama
Samoa na Jamus da Rundunar Sojojin Ruwa da Sojojin Australiya da suka kama New Guinea na Jamus. Ya yi tafiya tare da HMAS "Australia" don shiga cikin 2nd Battlecruiser Squadron a Rosyth, Scotland kuma a ranar 8 ga Fabrairun 1915, "Australia" ta zama babban jirgin ruwa na rundunar. An nada Patey a matsayin Babban Kwamandan, Arewacin Amurka da West Indies Station daga Maris 1915.