The Warrenpoint ambush[7][8] or Narrow Water ambush[9][10][11] (also called the Warrenpoint massacre[12][13][14][15] or Narrow Water massacre)[16][17][18] was a guerrilla attack[19] by the Provisional Irish Republican Army (IRA)'s South Armagh Brigade on 27 August 1979. The IRA ambushed the British Army with two large roadside bombs at Narrow Water Castle (near Warrenpoint) in Northern Ireland. The castle is on the banks of the Newry River, which marks the border between Northern Ireland and the Republic of Ireland.