The 1st Battalion was a Regular Army unit stationed in the Far East on the outbreak of the Second World War. The battalion fought the Imperial Japanese Army in the Malayan Campaign in early 1942 and sustained heavy casualties, temporarily amalgamating with the 2nd Battalion, East Surrey Regiment to create the British Battalion which was, however, later captured and the men of both battalions remained as prisoners of war (POWs) for the rest of the war. The battalion reformed in May 1942 by the redesignation of the 8th Battalion.