Kammala jumla mai zuwa: 7th (Service) Battalion da 8th (Service) Battalion sun sauka a Boulogne-sur-Mer a matsayin wani ɓangare na 41st Brigade a cikin 14th (Light) Division a watan Mayu 1915 don aiki a Yammacin Yamma. Rukunin na 8 ya shiga cikin Yaƙin Ypres na biyu, wanda ya fara a ranar 22 ga Afrilu 1915 da kuma aikin a Hooge a watan Yulin 1915 inda suka ga farkon amfani da masu tayar da wuta ta Jamus. An ba wa Laftanar Sidney Woodroffe, na 8th Battalion, lambar yabo ta Victoria Cross don ayyukansa a wannan yaƙi. Battalions kuma sun ga aiki a Yaƙin Ypres na biyu wanda ya fara a watan Afrilu na 1915 da kuma aiki kusa da La Brique a Belgium inda aka baiwa Corporal Alfred George Drake, shi ma na Battalion na 8, lambar yabo ta Victoria Cross saboda ayyukansa a ranar 23 ga Nuwamba 1915. Daga nan ne bataliya ta shiga cikin yakin Delville Wood a watan Satumbar 1916, yakin Flers <unk> Courcelette a watan Satumbar 1916 da kuma ci gaba zuwa layin Hindenburg da kuma yakin Arras a watan Afrilu 1917, yakin Langemark a watan Agusta 1917 da yakin Passchendaele a watan Oktoba 1917 kafin shiga cikin yakin basasa.
Yaƙin St Quentin a cikin Maris 1918 da Yaƙin Avre a watan Afrilu 1918.