Kammala jumla mai zuwa: A lokacin Yaƙin Duniya na Farko, rundunar ta yi aiki tare da babban jaruntaka a Yammacin Yamma a cikin 1914<unk>15, suna yaƙi a Yaƙin Givenchy, Neuve Chapelle, Aubers Ridge, Yaƙin Ypres na biyu da Yaƙin Loos. An ba Lieutenant William Bruce lambar yabo ta Victoria a lokacin yakin Givenchy. A shekara ta 1916, rundunar ta isa Mesopotamiya. A nan, ya yi yaƙi a cikin yaƙe-yaƙe na jini don
Taimako na Kut al Amara a kan Tigris Front a 1916-17, kama Baghdad, da kuma ayyukan arewacin Baghdad a Daur da Tikrit. Saboda halayyarta a lokacin yakin, an sanya shi "Royal" bataliya a 1921.