The 10th (Service) Battalion and 11th (Service) Battalion landed at Boulogne-sur-Mer as part of the 59th Brigade in the 20th (Light) Division in July 1915 for service on the Western Front. The battalions saw action at the Battle of Mont Sorrel in June 1916, the Battle of Delville Wood in September 1916 and the Battle of Guillemont in September 1916 as well as the Battle of Flers–Courcelette in September 1916, the Battle of Morval in September 1916 and the Battle of Le Transloy in October 1916 before taking part in the advance to the Hindenburg Line, the Battle of Langemarck in August 1917, the Battle of the Menin Road Ridge in September 1917, the Battle of Polygon Wood in September 1917 and the Battle of Cambrai in December 1917.