Kammala jumla mai zuwa: An kira Parry zuwa Bar a Haikali na ciki kuma yayi aiki a matsayin memba na Chester da Arewacin Wales Circuit. Da barkewar Yaƙin Duniya na Farko, Parry ya yi rajista kuma ya kasance ɗan ƙarami a cikin 5th Royal Welch Fusiliers, Territorials. Ya yi aiki a cikin gidan wasan kwaikwayo na Turai, Gallipoli, Misira da Falasdinu tsakanin 1914 da 1919. An ji masa rauni a Suvla Bay kuma an kwantar da shi a asibiti a Alkahira. A lokacin da ya ji rauni a Suvla, inda ya kuma kamu da sanyi, Parry ya tashi zuwa matsayin kyaftin. Ya kuma ji rauni sau uku a cikin aiki a
Gaza, wanda a wannan lokacin ya tashi zuwa matsayin Manjo, a cikin wannan rikici ya lashe lambar yabo ta musamman a shekarar 1917. Don jaruntakarsa a wasu ayyukan Parry an ambaci shi a cikin sakonni kuma ya lashe Dokar Nilu.