The 1st Battalion landed at Rouen as part of the 6th Brigade in the 2nd Division in August 1914 for service on the Western Front. It saw action at the Battle of Mons in August 1914, the First Battle of the Marne and the First Battle of the Aisne in September 1914 and First Battle of Ypres in October 1914. It fought at the Battle of Festubert in May 1915, the Battle of Loos in September 1915 and the Battle of the Somme in Autumn 1916 before taking part in the advance to the Hindenburg Line, the Battle of Arras in November 1917, the Battle of Cambrai in November 1917, the Second Battle of the Somme in Autumn 1918 and the Battle of the Selle in October 1918.