| March 1941 | CO: Lt Col JAL Powell |
| Mar 41 | North Irish Horse |
| 11/3/41 | Portrush Regt inspected by the Inspector General of Signals. |
| 17/3/41 | 2Lts PS Bolshaw and WAP Crowe joined for duty from 101 OCTU. |
| 19/3/41 | FGCM on Tpr Anderson W and Tpr Donaghy DF, under AA 6(2)(h) and 40. |
| 24/3/41 | FGCM on Anderson and Donaghy promulgated, Guilty on one charge, not-guilty on two. Sentenced to 168 hours detention. |
| 28/3/41 | 2Lt JF Armitage joined for duty from 102 OCTU. |
| 31/3/41 | During the month 17 new recruits enlisted into the Regt. |