The Warrenpoint ambush or Narrow Water ambush, also called the "Warrenpoint massacre" or "Narrow Water massacre", was a guerrilla attack by the Provisional Irish Republican Army (IRA) on 27 August 1979. The IRA's South Armagh Brigade ambushed the British Army with two large roadside bombs at Narrow Water Castle outside Warrenpoint, Northern Ireland. The first bomb was aimed at a British Army convoy and the second targeted the reinforcements sent to deal with the incident. IRA volunteers hidden in nearby woodland also allegedly fired on the troops. The castle is on the banks of the Newry River, which marks the border between Northern Ireland and the Republic of Ireland.
Eighteen British soldiers were killed and six were seriously injured, making it the deadliest attack on the British Army during the Troubles. An English civilian was also killed and an Irish civilian wounded by British soldiers firing across the border after the first blast. The attack happened on the same day that the IRA assassinated Lord Louis Mountbatten, a member of the British royal family.
The ambush took place on the A2 road at Narrow Water Castle, just outside Warrenpoint, Northern Ireland. The road and castle are on the northern bank of the Newry River, which marks the border between Northern Ireland and the Republic of Ireland. The Republic's side of the river was an ideal spot from which to launch an ambush: it was thickly wooded, which gave cover to the ambushers, and the river border prevented British forces giving chase.
On the afternoon of 27 August, a British Army convoy of one Land Rover and two four-ton lorries—carrying soldiers of the 2nd Battalion, Parachute Regiment—was driving from Ballykinler Barracks to Newry. The British Army were aware of the dangers of using the stretch of road along the Newry River and often put it out of bounds. However, they had to use it sometimes to avoid setting a pattern. At 16:40, as the convoy was driving past Narrow Water Castle, an 800-pound (363 kg) fertiliser bomb, hidden among strawbales on a parked flatbed trailer, was detonated by remote control by IRA members watching from across the border. The explosion caught the last lorry in the convoy, hurling it on its side and instantly killing six paratroopers, whose bodies were scattered across the road. There were only two survivors amongst the soldiers travelling in the lorry; they both received serious injuries. The lorry's driver, Anthony Wood (aged 19), was one of those killed. All that remained of Wood's body was his pelvis, welded to the seat by the fierce heat of the blast.
Immediately after the blast, the soldiers said they were targeted by sniper fire, coming from woods on the other side of the border. According to Royal Ulster Constabulary (RUC) researchers, the soldiers may have mistaken the sound of ammunition cooking off for enemy gunfire. Two IRA members arrested by the Gardaí (Irish police) shortly after, and suspected of being behind the ambush, had traces of gunsmoke residue on their hands and the motorbike they were riding on.
On hearing the blast, two civilian bystanders—William Michael Hudson, a 29-year-old from London, and his cousin Barry Hudson, from Dingle—drove to the riverbank on the Republic's side of the border to see what was happening. The men were partners in Hudson Amusements and had been running their funfair in Omeath at the time. Soldiers fired across the border at them; William was shot in the head and killed, Barry was shot in the arm and wounded.
The surviving paratroopers radioed for urgent assistance, and reinforcements were dispatched to the scene by road. A rapid reaction unit was sent by Gazelle helicopter, consisting of Lieutenant-Colonel David Blair, commanding officer of the Queen's Own Highlanders, his signaller Lance Corporal Victor MacLeod, and army medics. Another helicopter, a Wessex, landed to pick up the wounded. Colonel Blair assumed command once at the site.
The IRA had been studying how the British Army behaved after a bombing and correctly predicted that they would set up an incident command point (ICP) at the stone gateway on the other side of the road. At 17:12, thirty-two minutes after the first explosion, another 800-pound bomb exploded at the gateway, destroying it and hurling lumps of granite through the air. It detonated as the Wessex helicopter was taking off carrying wounded soldiers. The helicopter was damaged by the blast but did not crash.
The second explosion killed twelve soldiers: ten from the Parachute Regiment and the two from the Queen's Own Highlanders. Colonel Blair was the highest-ranking British Army officer to be killed in the Troubles up until then. Only one of Colonel Blair's epaulettes remained to identify him as his body had been vaporised in the blast. The epaulette was taken from the scene by Brigadier David Thorne to a security briefing with Prime Minister Margaret Thatcher to "illustrate the human factor" of the attack. Mike Jackson, then a major in the Parachute Regiment, was at the scene soon after the second explosion and later described seeing human remains scattered over the road, in the water and hanging from the trees. He was asked to identify the face of his friend, Major Peter Fursman, still recognisable after it had been ripped from his head by the explosion and recovered from the water by divers from the Royal Engineers. 
Press photographer Peter Molloy, who arrived at the scene after the first explosion, came close to being shot by an angry paratrooper who saw him taking photographs of the dead and dying instead of offering to help the wounded. The soldier was tackled by his comrades. Molloy said, "I was shouted at and called all sorts of things but I understood why. I had trespassed on the worst day of these fellas' lives and taken pictures of it". 
The Warrenpoint ambush was a propaganda victory for the IRA. It was the deadliest attack on the British Army during the Troubles and the Parachute Regiment's biggest loss since World War II, with sixteen paratroopers killed. General Sir James Glover, Commander of British forces in Northern Ireland, later said it was "arguably the most successful and certainly one of the best planned IRA attacks of the whole campaign". The ambush happened on the same day that Lord Louis Mountbatten, a prominent member of the British royal family, was killed by an IRA bomb aboard his boat at Mullaghmore, along with three others.
Republicans portrayed the attack as retaliation for Bloody Sunday (30 January 1972), when the Parachute Regiment shot dead 13 unarmed civilians during a protest march. Graffiti appeared in republican areas declaring "13 gone and not forgotten, we got 18 and Mountbatten". The day after the Mountbatten and Warrenpoint attacks, the Ulster Volunteer Force (UVF) retaliated by shooting dead a Catholic man, John Patrick Hardy (43), at his home in Belfast's New Lodge estate. Hardy was targeted in the mistaken belief that he was an IRA member.
Very shortly after the ambush, IRA volunteers Brendan Burns and Joe Brennan were arrested by Gardaí (the Irish police). They were stopped while riding a motorbike on a road opposite Narrow Water Castle. They were later released on bail due to lack of evidence. Burns died in 1988 when a bomb he was handling exploded prematurely. In 1998, former IRA member Eamon Collins claimed that Burns had been one of those who carried out the Warrenpoint ambush.
According to Toby Harnden, the attack "drove a wedge" between the Army and the RUC. Lieutenant-General Sir Timothy Creasey, General Officer Commanding Northern Ireland, suggested to Margaret Thatcher that internment should be brought back and that liaison with the Gardaí should be left in the hands of the military. Sir Kenneth Newman, the RUC Chief Constable, claimed instead that the British Army practice, since 1975, of supplying their garrisons in South County Armagh by helicopter, gave too much freedom of movement to the IRA. One result was the appointment of Sir Maurice Oldfield to a new position of Co-ordinator of Security Intelligence in Northern Ireland. His role was to co-ordinate intelligence between the military, MI5 and the RUC. Another was the expansion of the RUC by 1,000 members. Tim Pat Coogan asserts that the deaths of the 18 soldiers hastened the move to Ulsterisation.
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From the time of the Ulsterisation, normalisation and criminalisation policy formulations in the mid-seventies it had become obvious that, if the conflict was to be Vietnamised and the natives were to do the fighting, then the much-talked-about 'primacy of the police' would have to become a reality. The policy was officially instituted in 1976. But if one had to point to a watershed date as a result of which the police actually wrested real power from the army I would select 27 August 1979.
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- Warrenpoint falls silent as soldiers’ families recall IRA massacre
- Warrenpoint ambush remembered