| Date | Place | Incident | Deaths |
| 1920 Sep 11 | Kilkenny | Kilkenny Mail Bag Raid | 0 |
| 1920 Sep 20 | Limerick | Abbeyfeale Murders | 0 involving ADRIC |
| 1920 Sep 28 | Co Meath | Trim attacked by British, probably not ADRIC | 0 involving ADRIC |
| 1920 Oct | Dublin | IRA bank raided | 0 |
| 1920 Oct 10 | Co Galway | Mannox , West, and Burke Court Martialed | 0 |
| 1920 Oct 10 | Dublin | T/CadetWJ Anderson, accidently shot, | 1 ADRIC |
| 1920 Oct 14 | Kilkenny | Lawler & Loughman arrested | 0 |
| 1920 Oct 16 | Macroom | Lehane shot | 1 Irish |
| 1920 Oct 16 | Dublin | O'Carroll murder | 1 Irish |
| 1920 Nov 1 | Galway | Eileen Quinn shot | 1 Irish |
| 1920 Oct 22 | Athlone | Shooting of M Burke at Athlone | 1 Irish |
| 1920 Nov 4 | Athlone | Looting - probably Black & Tans | 0 |
| 1920 Nov 5 | Kerry | 2 men wounded - probably Black & Tans | 0 |
| 1920 Nov 6 | Co Cork | Agnew & Mitchell Abducted | 2 ADRIC |
| 1920 Nov 10 | Co Cork | Lucey shot | 1 Irish |
| 1920 Nov 11 | Galway |
T/Cadet R Ward died of epilepsy | 1 ADRIC |
| 1920 Nov 12 | Kerry | Ballymacelligott | 2 Irish |
| 1920 Nov 14 | Co Galway | Father Griffin murdered | 1 Irish |
| 1920 Nov 15 | Co Kilkenny | GLO Shiner accidently wounded | 0 |
| 1920 Nov 17 | Co Clare | Killaloe Bridge murders | 4 Irish |
| 1920 Nov 20 | Dublin | T/Cadet HE Spenle - suicide | 1 ADRIC |
| 1920 Nov 20 | Dublin | Clune , Clancy & McKee shot in ADRIC Guardroom | 3 Irish |
| 1920 Nov 21 | Dublin | Bloody Sunday | 2 ADRIC plus British Army |
| 1920 Nov 21 | Dublin | Croke Park | 14 Irish |
| 1920 Nov 22 | Co Clare | Motor Accident | 2 ADRIC V&D div |
| 1920 Nov 23 | Naas | Crozier involved in bad car accident | 0 |
| 1920 Nov 24 | Co Galway | Michael Moran shot | 1 Irish |
| 1920 Nov 26 | Co Limerick | Duggan shot at Broadford | 1 Irish |
| 1920 Nov 26 | Co Galway | Loughnane Brothers Murdered | 2 Irish |
| 1920 Nov 26 | Co Dublin | Vico Road fake photos | 0 |
| 1920 Nov 28 | Co Cork | Kilmichael Ambush | 17 ADRIC (inc 1 V&D) |
| 1920 Nov 30 | Co Cork | O'Sullivan shot I cannot link his death to ADRIC | - |
| 1920 Dec 1 | Cork | Johansen shot. I cannot link his death to ADRIC | - |
| 1920 Dec 1 | Co Tipperary | Prendergast Murder | 1 Irish |
| 1920 Dec 6 | Dublin | T/Cadet HA Balls shot on a raid in Dublin | 1 ADRIC |
| 1920 Dec 9 | Cork | Fleming shot | 1 Irish |
| 1920 Dec 9 | Kilkenny | Ernie O'Malley captured | 0 |
| 1920 Dec 11 | Cork | Dillon's Cross Ambush | 1 ADRIC |
| 1920 Dec11/12 | Cork | The Burning of Cork | 0 |
| 1920 Dec 14 | Dublin | Ballsbridge Post Ofice | 0 |
| 1920 Dec 15 | Cork | Guest shot | 0 |
| 1920 Dec 15 | Co Cork | Canon Magner Murder | 2 Irish |
| 1920 Dec 17 | Co Lim? | Harrison WN and Taylor AH wounded | 0 |
| 1920 Dec 19 | Co Tipp | Connors and Walton shot | 2 Irish |
| 1920 Dec 21 | Kilkenny | Margret Ryan shot in Callan | |
| 1920 Dec 23 | Roscommon | Strokestown Bank Robbery not ADRIC | 0 |
| 1920 Dec 23 | Co Kerry | Moynihan Shot | 1 Irish |
| 1920 Dec 25 | Co Kerry | Shooting of Reidy and Lean | 2 Irish |
| 1920 Dec 26 | Co Cork | Street robbery in Cork | 0 |
| 1920 Dec 31 | Co Cork | Dunmanway Bank Raid | 0 |
| 1921 Jan 1 | Limerick | T/Cadet GPT Dean - cardiac failure. | 1 ADRIC |
| 1921 Jan 3 | Co Cork | Casey shot | 1 Irish |
| 1921 Jan 6 | Cork | Finbarr Darcy shot in Cork - by military not ADRIC | 0 |
| 1921 Jan 9 | Dublin | Grenade attack on tender | 0 |
| 1921 Jan 9 | Dublin | Auxiliaries raid a Dublin Fire Station | 0 |
| 1921 Jan 10 | Dublin | Civilian Farrell shot | 1 Irish |
| 1921 Jan 12 | Dublin | Bomb attack, Batchelors Walk | 0 |
| 1921 Jan 13 | Dublin | Clare St bomb attack | 0 |
| 1921 Jan 15 | Longford | Ballymahon Ambush | 0 |
| 1921 Jan 17 | Longford | Longford Barracks | 0 |
| 1921 Jan 18 | Co Galway | Kilroe Ambush | 0 |
| 1921 Jan 18 | Co Galway | Thomas Collins shot - by RIC | - |
| 1921 Jan 19 | Dublin | Parliament St, Dublin | 0 |
| 1921 Jan 21 | Dublin | Tolka Bridge Ambush | 1 Irish |
| 1921 Jan 24 | Dublin | Death of Mary Hudson | 1 Irish |
| 1921 Jan 28 | Co Kerry | PME Hall accidently shot | 1 ADRIC |
| 1921 Jan 28 | Co Cork | Dripsey Ambush - ADRIC not involved | - |
1921 Jan 29 |
Co Kerry | T/Const Charles Ingledew - shot himself | 1 ADRIC v&d |
| 1921 Jan 29 | Dublin | North Earl St attack | 0 |
| 1921 Jan 29 | Co Tipp | Const Sweeney accidently shot | 1 RIC |
| 1921 Jan 30 | Dublin | Mrs Freeman, wife of a British soldier, shot | 1 civilian |
| 1921 Jan 31 | Mallow | Mallow shootings - little to link to ADRICs | - |
| 1921 Feb 2 | Co Longford | Clonfin Ambush | 4 ADRIC |
| 1921 Feb 3 | Co Longford | M Farrell shot | 1 Irish |
| 1921 Feb 3 | Dublin | Sarah Fitzpatrick died | 1 Irish |
| 1921 Feb 4 | Dublin | Bomb attack on tender | 0 |
| 1921 Feb 8 | Co Meath | Trim shooting | 0 |
| 1921 Feb 9. | Co Meath | Trim Looting | 0 |
| 1921 Feb 9 | Dublin | Drumcondra Murders | 2 Irish |
| 1921 Feb 11 | Co Cork | Mahoney shot | 1 Irish |
| 1921 Feb 13 | Co Cork | Macroom Town Hall | 0 |
| 1921 Feb 20 | Dublin | Phibsboro Grenade Attack | 0 |
| 1921 Feb 20 | Co Cork | Clonmult Ambush on IRA - not ADRIC | - |
| 1921 Feb 23 | Co Dublin | P Howard shot - RIC, not ADRIC | - |
| 1921 Feb 25 | Co Cork | Coolavohig Ambush | 2 ADRIC |
| 1921 Feb 25 | Trim | VR Scott shot, probably suicide | 1 ADRIC |
| 1921 Feb 26 | Thurles | J Stapleton shot | 1 Irish |
| 1921 Feb 27 | Co Kilkenny | Goresbridge | 0 |
| 1921 Feb 28 | Co Longford | Sentry wounded | 0 |
| 1921 Mar 1 | Co Cork | S O'Brien shot | - |
| 1921 Mar 6 | Dublin | H Guy shot by an I Coy patrol | 1 Irish |
| 1921 Mar 6 | Co Cork | C Foley shot | 1 Irish |
| 1921 Mar 7 | Limerick | Murder of Lord Mayors of Limerick | 2 Irish |
| 1921 Mar 10 | Balbriggan | Robbery | 0 |
| 1921 Mar 11 | Leitrim | Selton Hill Ambush - not ADRIC | - |
| 1921 Mar 12 | Co Kerry | Falkiner killed at Tubrid train ambush | 1 ADRIC |
| 1921 Mar 13 | Co Cork | Hourihan shot | 1 Irish |
| 1921 Mar 14 | Dublin | Brunswick St Raid | 2 ADRIC & 6 Irish |
| 1921 Mar 15 | London | Coordinated assassination attempts in England | 1 civilian |
| 1921 Mar 16 | Co Galway | Burning of Clifden, Galway- not ADRIC | - |
| 1921 Mar 19 | Co Waterford | Burgery Ambush- not ADRIC | - |
| 1921 Mar 21 | Kings Co | Burke Shot, Borrisoleigh | 1 Irish |
| 1921 Mar 23 | Co Cork | 6 IRA shot by British at Ballycannon, Clogheen | - |
| 1921 Mar 24 | Co Roscommon | M Mullooly - shot near Strokestown | 1 Irish |
| 1921 Mar 24 | Co Galway | Shooting of Louis D'Arcy | 1 Irish |
| 1921 Mar 26 | Kerry | Shooting of W McCarthy | 1 Irish |
| 1921 Mar 27 | Kings Co | Shooting of J O'Leary | 1 Irish |
| 1921 Mar 31 | Dublin | JL Griffiths shot by mistake | 1 ADRIC |
| 1921 Apr 1 | Dublin | Rifle accident | 0 |
| 1921 Apr 9 | Co Kerry | Driscoll shot at Liscahane | 1 Irish |
| 1921 Apr 11 | Dublin | Attack on LNWR Railway Hotel | 1 Irish |
| 1921 Apr 13 | Dublin | T/Const PJ Neary accidently shot | 1 ADRIC V&D |
| 1921 Apr 13 | Co Kerry | DI1 Mackinnon shot playing golf | 1 ADRIC |
| 1921 Apr 16 | Dublin | T/Cadet PJ O'Neill shot | 1 ADRIC |
| 1921 Apr 17 | Co Waterford | Const William J.Duncan accidently shot - RIC | - |
| 1921 Apr 17 | Co Limerick | Castleconnell Shooting at Shannon View Hotel | 1 ADRIC & 2 Irish |
| 1921 Apr 17 | Dublin | Ambush on Eden Quay | 0 |
| 1921 Apr 19 | Dublin | Hulse wounded | 0 |
| 1921 Apr 19 | Co Limerick | Wounded in a pub | 0 |
| 1921 Apr 21 | Co Kerry | T/Const D O`Loughlin shot | 1 ADRIC V&D |
| 1921 Apr 21 | Co Cork | P Goggin shot at Ballinagree | 1 Irish |
| 1921 Apr 21 | Co Kilkenny | Car hits broken bridge | 0 |
| 1921 Apr 22 | Dublin | Dempsey shot | 1 Irish |
| 1921 Apr 23 | Dublin | Army checkpoint fires on RIC from Gormanston | 1 RIC |
| 1921 Apr 24 | Belfast | Bales & Bolam shot | 2 ADRIC |
| 1921 Apr 29 | Co Cork | Macroom shooting | 0 |
| 1921 Apr 29 | Dublin | Ambush in Great Brunswick St | 0 |
| 1921 May | Dublin | Details of Raids | - |
| 1921 May 6 | Co Cavan | Seefin Ambush | 0 |
| 1921 May 7 | Co Mayo | M Tolan disappears | 1 |
| 1921 May 9 | Dublin | Raid that arrests Erskine Childers | 0 |
| 1921 May 14 | Dublin | T/Const R Redmond shot | 1 ADRIC V&D |
| 1921 May 14 | Co Tipperary | Biggs Ambush - Coolboreen | 1 ADRIC & 1 Irish |
| 1921 May 14 | Dublin | Armoured Car raid at Mountjoy Prison | 1 Soldiers |
| 1921 May 15 | Co Galway | Ballyturin Ambush | 1 ADRIC & 3 others |
| 1921 May 16 | Dublin | T/Cadet C E Crabbe suicide | 1 ADRIC |
| 1921 May 20 | Dublin | Bolton St bomb attack | 0 |
| 1921 May 22 | Co Tipperary | Gleeson shot by B Coy | 1 Irish |
| 1921 May 25 | Dublin | The Burning of the Custom House | 5 Irish |
| 1921 May 26 | Co Cork | Clohina Ambush | 0 |
| 1921 May 28 | Co Cork | P Hickey shot | - |
| 1921 May 29 | Dublin | St Stephens Green Grenade Attack | 0 |
| 1921 May 29 | Dublin | 2 ADRIC in a tram that was held up by IRA | 0 |
| 1921 June | Dublin | Details of Raids | - |
| 1921 Jun 4 | Dublin | Henry O'Rourke shot | 1 Irish |
| 1921 Jun 7 | Dublin | Attacks on ADRIC in Dublin | 0 |
| 1921 Jun 8 | Cork | Crowley shot | 1 Irish |
| 1921 Jun 9 | Dublin | Ringsend ambush | 0 |
| 1921 Jun 10 | Kilkenny | T/Cadet French missing presumed dead | 1 ADRIC |
| 1921 Jun 10 | Co. Cork | Civilian shot in Macroom by army | - |
| 1921 Jun 11. | Co Clare | Darragh Ambush | 0 |
| 1921 Jun 16 | Co Wexford | DI CR Mason died shooting accident | 1 ADRIC |
| 1921 Jun 16 | Dublin | Attack on Q Coy Tender | 0 |
| 1921 Jun 16 | Co Cork | Rathcoole Ambush | 2 ADRIC |
| 1921 Jun 21 | Dublin | Great Brunswick St grenade attack | 0 |
| 1921 Jun 24 | Dublin | Appleford & Warnes shot in Grafton St | 2 ADRIC |
| 1921 Jun 24 | Kerry | Dineen shot | 1 Irish |
| 1921 Jun 26 | Dublin | T/Cadet WF Hunt shot | 1 ADRIC |
| 1921 Jun 27 | Limerick | Cremins shot | 1 Irish |
| 1921 Jun 28 | Dublin | Dolphin's Barn ambush | ) |
| 1921 Jun 30 | Kerry | Moynihan shooting | 1 Irish |
| 1921 Jul 4 | Dublin | Riot in Dominick St | 0 |
| 1921 Jul 8 | Dublin | Civilian ADRIC workers with guns in pub | 0 |
| 1921 Jul 19 | Dublin | T/Cadet R L Stockdale in motor accident | 1 ADRIC |
| 1921 Jul 20 | Co Kilkenny | T/Cadet C N Regnart - suicide | 1 ADRIC |
| 1921 Aug 8 | Dublin | T/Cadet FW Morrison - suicide | 1 ADRIC |
| 1921 Sep ? | Co Cork | Affray at Ardfert Station | 0 |
| 1921 Oct 2 | Galway | Lt Souchon shot passing town hall | 1 Army |
| 1921 Oct 9 | Irish Sea | T/Cadet R J Thomson drowned | 1 ADRIC |
| 1921 Oct 21 | Kerry | 12 men from L Coy suspended for discipline reasons | 0 |
| 1921 Oct 25 | Co Clare | M Brook's death - accident - not ADRIC | - |
| 1921 Nov 26 | Co Clare | Shooting at Corofin | 0 |
| 1921 Dec 16 | Co Limerick | T/Cadet T Enright shot | 1 ADRIC |
| 1921 Dec 28 | England | T/Cadet A F Leggatt motor accident | 1 ADRIC |