 At the outbreak of the war, the regiment was an unbrigaded unit of the 5th (Mhow) Division of the Indian Army.However, in 1914 it joined the Army's 3rd (Lahore) Division as part of its 9th (Sirhind) Brigade, landing at Marseilles on 26 September 1914 and taking part in Winter Operations (1914–1915), the Battle of Neuve Chapelle (10–13 March 1915), the Battle of Aubers, the Battle of Festubert (15–25 May 1915), and the Battle of Loos subsidiary attack at the Moulin-du-Piètre on 25 September 1915.The 125th left the 3rd Division in 1915 to join the 7th (Meerut) Division.