113 (Home Counties) Field Regiment RA (TA) was formed in May 1939 with two batteries as a duplicate of 57 Field Regiment. In February 1941 a third battery was formed. Post war 113 (Home Counties) Field Regiment RA (TA) went into suspended animation in November 1945 and was re-constituted as 313 (Sussex) Heavy Regiment RA (TA) in January 1947.
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.
(Title authorised February 1942)
| May 39 |  |
12 Infantry Division | Shoreham, Sussex, UK |
| Apr 40 | Home Forces | UK | |
| Jul 40 |  |
1 London Infantry Division | South East England |
| Nov 40 | |
56 Infantry Division | South East England |
| Nov 42 | |
56 Infantry Division | Iraq |
| Mar 43 | |
56 Infantry Division | Tunisia |
| Apr 43 | |
56 Infantry Division | Tripoli, Libya |
| Sep 43 | |
56 Infantry Division | Salerno, Italy |
| Sep 43 | |
56 Infantry Division | Naples, Italy |
| Oct 43 | |
56 Infantry Division | Volturno Line, Italy |
| Nov 43 | |
56 Infantry Division | Monte Camino, Italy |
| Jan 44 | |
56 Infantry Division | River Garigliano, Italy |
| Feb 44 | |
56 Infantry Division | Anzio, Italy |
| Mar 44 | |
56 Infantry Division | N Africa |
| Jul 44 | |
56 Infantry Division | Gothic Line, Italy |
| Apr 45 | |
56 Infantry Division | Lake Comacchio, Italy |
| Apr 45 | |
56 Infantry Division | Venice, Italy |
| Nov 45 | Suspended animation |
Batteries
| May 39 | 227 (Hove), 228 (Worthing) |
| Feb 41 | 227, 228, 478 |