Kammala jumla mai zuwa: Rukunin ya fara Yaƙin Duniya na Farko yana yaƙi a Yaƙin Frontiers, sannan ya yi yaƙi a Gasar zuwa Tekun, wanda ya ƙare a Yaƙin Yser. Rukunin ya kasance a gaban Yser har zuwa Janairu 1916, lokacin da aka tura shi zuwa kusa da Verdun. Daga nan sai ya yi yaƙi a yakin Verdun kuma ya ga aiki a cikin matakan baya na yakin Somme. Ya shafe rabin rabin shekarar 1917 a cikin rami na Champagne kuma ya yi aiki a cikin
Yaƙin Aisne na biyu, wanda aka fi sani da Yaƙin Champagne na Uku (kuma ga Jamusawa a matsayin Yaƙin Aisne-Champagne na Biyu). Daga nan sai ya koma Flanders kuma ya ga aikin a yakin Passchendaele. A cikin 1918, ya yi yaƙi a cikin farmakin bazara na Jamus kuma ya kasance a yankin Flanders a lokacin hare-haren da aka yi a baya. Ƙungiyar Allied Intelligence ta ƙayyade sashen a matsayin na biyu.