| April 1940 | CO: Lt Col JAL Powell |
| Apr 40 | North Irish Horse |
| 2/4/40 | Enniskillen 2Lt M Montgomery appointed Gas Officer |
| 7/4/40 | Strong as possible Church Parade. Officers 10, ORs 243. |
| 12/4/40 | Major the Earl of Erne proceeded for attachment to 12th Royal Lancers, BEF, France. |
| 15/4/40 | 30 ORs proceeded to Belfast to undergo a course of MT driving and maintenance held at WH Reay & Co, Automobile Engineers. |
| 21/4/40 | 2Lt JP Herdman transferred to RARO in order to return to work of vital National Importance. 2Lt CA Crofton takes over duties of Weapons Training Officer. |
| 22/4/40 | Capt Sir Norman Stronge MC relinquishes his commission on account of ill-health. |
| 29/4/40 | Notification that 2Lt RD Morton is posted to this unit from OCTU Sandhurst.Regt Strength:-
| Officers | 17 |
| Sgts | 26 |
| WOs | 9 |
| ORs | 444 |
Total 496. |