From January to May 1915, it fought in operations on the River Meuse and Argonne, both in les Eparges and the First Battle of Champagne. On 24 April that year, the Regiment was brought together to campaign near Rupt-en-Woëvre – before going, it performed a march past the general commanding 12th Infantry Division, who then decorated two of the Regiment's officers with the Légion d’Honneur. The Regiment was then mentioned in dispatches for its sustained fighting from 26 December onwards, when the Regiment was put on alert at lunchtime and went on to base itself on the edge of the Châtelaine forest opposite Mouilly. On Sunday 25 April it linked up with France's 132nd Infantry Regiment on its left. Under German 105 and 150 bombardment, the 54th was ordered to make its trenches unwinnable. The 87th Infantry Regiment had to attack before the 54th but the attack failed and night arrived.