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 underwent a significant expansion in January 1939 with the addition of two new brigades. Later, in December 1942, the 4th Cavalry Brigade was reassigned to a different army unit, while the remaining elements of the Cavalry Group were reorganized into a new tank division.