1914
August
19: A Squadron lands at Le Havre as GHQ Troops
22: C Squadron lands at Le Havre as Divisional Cavalry to 5th Division
October
12: C Squadron joins A Squadron as GHQ Troops
1915
April
14: C Squadron transfers to 3rd Division as Divisional Cavalry
May
2: D Squadron lands at Le Havre as Divisional Cavalry to 51st (Highland) Division
October
6: 6th Inniskilling Dragoons (Service Squadron) arrives at Le Havre as Divisional Cavalry to 36th (Ulster) Division
November
17: F Squadron lands at Le Havre as Divisional Cavalry to 33rd Division
1916
January
4: A Squadron transfers to 55th Division as Divisional Cavalry
12: E Squadron lands at Le Havre as Divisional Cavalry to 34th Division
April
12-26: C Squadron training with 2nd Cavalry Division
19-11: May F Squadron training with 1st Cavalry Division
May
10: A, D and E Squadrons form 1st Regiment, North Irish Horse, attached to VII Corps
C Squadron transfers to 49th (West Riding) Division as Divisional Cavalry
16: F Squadron transfers to 49th (West Riding) Division as Divisional Cavalry
20: F Squadron transfers to 32nd Division as Divisional Cavalry
25: F Squadron renamed B Squadron
June
1: C Squadron transfers to 36th (Ulster) Division as Divisional Cavalry
21: B and C Squadrons and 6th Inniskilling Dragoons (Service Squadron) form 2nd Regiment, North Irish Horse, attached to X Corps
1917
July
16: 1st Regiment transfers to XIX Corps
August
14-31: 2nd Regiment dismounts to infantry training. Some 265 horses sent to Egypt via Marseilles with party under Lieutenant Leader
September
5: 67 Other Ranks supernumerary to 1st Regiment transfer to 36th Infantry Base Depot
7: 1st Regiment transfers to V Corps
25: 304 NIH Other Ranks join 9th (Service) Battalion Royal Irish Fusiliers, 108th Brigade, 36th (Ulster) Division, which is renamed the 9th (North Irish Horse) Battalion Royal Irish Fusiliers
October
12: 72 NIH Other Ranks join 9th (NIH) Battalion Royal Irish Fusiliers
1918
February
18-28: 1st Regiment begins to dismount and become V Corps Cyclist Battalion (North Irish Horse)
March
1-13: 1st Regiment finalises dismount. Transfers out 10 ASC drivers to A.H. Transport, 9 Officers and 63 Other Ranks to Machine Gun Base Depot, 3 Other Ranks to Cavalry Base Depot.
17: One Officer 24 Other Ranks transfer in from former V Corps Cyclists.
1919
June
9: Final entry in 9th Battalion RIF and V Corps Cyclist Regiment War Diaries