This is a list of Royal Northumberland Fusiliers battalions in World War II. At the outbreak of the Second World War in September 1939 the Royal Northumberland Fusiliers, a fusilier infantry regiment of the British Army, consisted of seven battalions. A further three were raised during the war. Prior to the war, the regiment was one of a number that been selected to transition from an infantry role to a support role and be equipped with the Vickers machine gun. While most battalions served as divisional machine gun or support battalions, several undertook different roles: motorcycle, searchlight, tank, reconnaissance, regular infantry, and deception units. The regiment saw action with the British Expeditionary Force (BEF) during the Battle of France and Dunkirk, defended the United Kingdom