77 (Duke of Lancaster’s Own Yeomanry) Medium Regiment RA (TA) was formed from The Duke of Lancaster’s Own Yeomanry with two batteries in February 1940. The Regiment was placed into suspended animation in February 1946. 77 (Duke of Lancaster’s Own Yeomanry) Medium Regiment RA (TA) was reconstituted as The Duke of Lancaster’s Own Yeomanry, Royal Armoured Corps (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.
| Feb 40 | Formed from Duke of Lancaster’s Own Yeomanry | Ramsbottom, Greater Manchester, UK | |
| Feb 40 |  |
Northern Ireland District | Northern Ireland, UK |
| Apr 44 |  |
2 Army | UK |
| 15 Jun 44 | |
2 Army, 8 Army Group RA | Normandy, France |
| Jul 44 | |
2 Army, 8 Army Group RA | Gruchy, France |
| Aug 44 | |
2 Army, 8 Army Group RA | Vire, France |
| Sep 44 | |
2 Army, 8 Army Group RA | Petit Brogel, Belgium |
| Sep 44 | |
2 Army, 8 Army Group RA | St Anthonis, Holland |
| Dec 44 | |
2 Army, 8 Army Group RA | Sevenum, Holland |
| Feb 45 | |
2 Army, 8 Army Group RA | Oostrum, Holland |
| Mar 45 | |
2 Army, 8 Army Group RA | Menzelen, Germany |
| Apr 45 | |
2 Army, 8 Army Group RA | Münster, Germany |
| May 45 | |
2 Army, 8 Army Group RA | Todendorf, Germany |
| May 45 | |
2 Army, 8 Army Group RA | Rendsburg, Germany |
Batteries
| Feb 40 | A, B |
| Mar 42 | P, Q |
| Jan 43 | 103, 104 |
Equipment
| Jun 44 | 5.5 inch Gun |