Initially the Corps included the HQ, two Rifle Brigades (numbered 1 and 2), five en cadre Rifle Brigades (3, 4, 5, 7 and 8, usually battalion-sized), as well as service units. By late 1940 the Corps had over 14,000 men at arms. The 2nd Rifle Brigade was reformed into the 10th Armored Brigade on 3 October 1940. In 1942, this formation was expanded to the 1st Armoured Division. The 4th Brigade became the 1st Independent Parachute Brigade on 9 October 1941. 3rd, 5th and 7th Brigades formed the Training Brigade on 6 December 1941.