4 Medium Brigade was re-designated 4 Medium Regiment RA in May 1938. It was re-organised with two batteries in February 1939. It fought in France with the BEF in 1939. The Regiment moved to North Africa in November 1942 and to Italy the following year. In April 1947 4 Medium Regiment RA was re-designated 58 Medium Regiment RA.
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| 3 Sep 39 |  |
Southern Command | Fort Brockhurst, Hampshire, UK |
| Oct 39 | British Expeditionary Force | France | |
| Jun 40 | Home Forces | UK | |
| Jul 40 | Home Forces | Southborne, Dorset, UK | |
| Oct 42 |  |
1 Army | UK |
| Nov 42 | |
1 Army | N Africa |
| Sep 43 |  |
8 Army | Italy |
| Apr 45 |  |
1 Army Group RA | Italy |
Batteries
| Sep 39 | 9/13, 14/16 |
Equipment
| Sep 39 | 6 inch Howitzers |