The South Mayo Brigade of the Irish Republican Army (IRA), commanded by Commandant Tom Maguire ambushed an RIC/Black and Tan re-supply patrol in the village of Tourmakeady, County Mayo in the west of Ireland in order to destroy the patrol and to cause the closure of Derrypark RIC Barracks, seven miles to the south.

[1] Another IRA Volunteer, Pádraig Feeney, was also killed that afternoon, a monument in Tourmakeady commemorates him.

[2] Royal Irish Constabulary Constables Christopher O'Regan, William Power and Sergeant John Regan were killed in the battle.

[3] Following the ambush, the Flying Column took to the nearby Partry Mountains and were subsequently engaged by British troops from the Border Regiment.

On 3 May 1921, in reprisal for the ambush, Crown forces burned several commercial establishments and homes in the area.