The 1st Battalion, a Regular Army unit, was serving with the 15th Infantry Brigade, alongside the 1st Battalion, Green Howards and the 1st Battalion, York and Lancaster Regiment, and was sent to France in 1939, as part of 5th Infantry Division. In April 1940, with the brigade, the battalion was sent to Aandelsnes, Norway where they saw service as part of "Sickleforce" in the Norwegian Campaign and earned its first battle honour "Kvam" before it was evacuated on 1 May / 2 May. A period of training followed, with the battalion spending time in Scotland, Lancashire and Northern Ireland. In January 1942, the battalion commenced training for tropical service and moved to Poona, India. It was then decided to train for desert warfare and so the battalion was moved to Iran and then the Canal Zone for further training. The battalion next saw action in July 1943 during the Allied invasion of Sicily, and later the Allied invasion of Italy, before fighting through the Italian Campaign, in the Battle of Anzio and Operation Diadem before, in July 1944, being sent to Palestine to rest and refit. The battalion remained there until early 1945, when it was transferred to Italy again, only to be transferred to Marseilles in March 1945 for service in North-western Europe for the invasion of Germany. There, the battalion ended its war, fighting its last action at Potrau on 1 May 1945, some five years after it was evacuated from Norway.