The Metropolitan Artillery Volunteers (popularly known as 'Truro's Tigers') was a part-time unit of the British Volunteer Force formed in the London area in 1861. It was designated the 3rd Middlesex Artillery Volunteers and went on to become the 5th London Brigade, Royal Field Artillery in the Territorial Force. It provided two active service units in World War I, which saw action on the Western Front. Just before World War II it again spun off a duplicate regiment, each taking the '5th London' subtitle. Both regiments saw widely varied service during the war. The regiment later provided an airborne artillery unit in the Territorial Army of the 1950s.