The 1st Battalion landed at Le Havre as part of the 3rd Brigade in the 1st Division with the British Expeditionary Force in August 1914 for service on the Western Front. The 2nd Battalion landed at Laoshan Bay for operations against the German territory of Tsingtao in September 1914 and saw action at the Siege of Tsingtao in October 1914. After returning home in January 1915, the 2nd Battalion landed at Cape Helles as part of the 87th Brigade in the 29th Division in April 1915; it was evacuated from Gallipoli in January 1916 and then landed at Marseille in March 1916 for service on the Western Front.