In January 1939 the Cavalry Group was added, consisting of the 1st Cavalry Brigade and 4th Cavalry Brigade. In December 1942, the 4th Cavalry Brigade was sent to the Twelfth Army and the remainder of the Cavalry Group was converted into the 3rd Tank Division.
The Cavalry Group expanded with the inclusion of the 1st and 4th Cavalry Brigades in January 1939. Subsequently, in December 1942, the 4th Cavalry Brigade was redeployed to the Twelfth Army, while the rest of the Cavalry Group was reorganized into the 3rd Tank Division.