| June 1940 | CO: Lt Col JAL Powel |
| Jun 40 | North Irish Horse |
| 4/6/40 | Enniskillen CO announced with regret the death of Major the Earl of Erne, from wounds received on Active Service whilst attached to 12th Royal Lancers in France, |
| 5/6/40 | Sgt Brown and one OR, Royal Corps of Signals, attached to Regt and posted to HQ Sqn. |
| 6/6/40 | W/SSgts Batchen TM, Hutton RS, & Sidebottom RSH, posted to OCTU RAC Wing Sandhurst. DCM on Tpr Patton promulgated and sentence of 56 days detention awarded. AA 8(2). |
| 15/6/40 | Under orders of GOC, training subordinated to Defensive arrangements. |
| 16/6/40 | Localities in the immediate area of Enniskillen recced for defensive blocks and posts. 2Lts WH Ketchell, P Welch, GP Russell, RJ Griffith joined Regt for duty and posted to C Sqn, A Sqn, B Sqn, and A Sqn respectively. |
| 17/6/40 | NID Operation Instruction No. 1 dated 15/6/40. General Policy confirmed that there should be no withdrawal of forces in the defence of NI.
- Orders that Mobile Column will be at 30 mins notice between dusk and dawn.
- Alternative sites for locations to be prepared by HQ.
- All HQs to be prepared for all-round defence and garrison detail.NID Op.
Instruction No. 2 states that:-
- NIH will hold 10 Armoured cars in readiness to send away wherever required.
- RUC including B Force come under operational control of Military Commanders in their areas in the event of operations.
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| 18/6/40 | 61st Div and attached troops moved to NI. Regt remains under command 159th Inf Bde. |
| 20/6/40 | Increased instruction on the use of rifles and infantry tactics. Erection of road blocks at 13 places guarding all entrances to Enniskillen commenced. |
| 24/6/40 | Detachment of 6 ACs commanded by Lt H Petch DCM despatched to Londonderry for attachment to commander 182 Bde. |
| 26/6/40 | Construction of 4 main road blocks and posts in Enniskillen itself taken over by REs. Trenches dug and all posts manned by night.
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| 30/6/40 | Major D Dawnay, 10th Royal Hussars posted to Regt and attached HQ Sqn. Capt OC Smith-Bingham selected to attend War Staff course commencing Sept 1940. "Lt KG Pomeroy granted unpaid acting rank of Captain. |