Qualla: Assassination of Lord Mountbatten

Assassination of Lord Mountbatten: Introduction

Sat, 23 May 2026 00:00:00 GMT

Photo credit JohnArmagh, CC0. At 11:25 on the morning of 27 August 1979, a 28-foot cabin cruiser called Shadow V slowed beside its lobster pots in the calm water off Mullaghmore, County Sligo. A man on the cliffs above flicked the modified controls of a model aeroplane. The radio signal reached the gelignite hidden under the deck. The boat lifted into the air and disintegrated, and four people died: Louis Mountbatten, who was 79 and at the helm; Nicholas Knatchbull, his fourteen-year-old grandson; Paul Maxwell, a fifteen-year-old boy from Enniskillen who was working as a boatboy; and Nicholas's grandmother Doreen, the Dowager Lady Brabourne, who was 83 and died the next morning at Sligo General Hospital. Three other passengers survived with severe injuries. It was a calm morning. There was very little wind. The bomb did not need the help of weather.

Image: JohnArmagh | CC0

Assassination of Lord Mountbatten: Four People, Not One

Sat, 23 May 2026 00:00:00 GMT

Photo credit Allan Warren, CC BY-SA 3.0. The shorthand for what happened that morning - "the assassination of Lord Mountbatten" - is true and incomplete. Mountbatten was the named target, the British statesman whose connection to the royal family made him valuable as a symbol to the people who planned the bombing. But t...

Image: Allan Warren | CC BY-SA 3.0

Assassination of Lord Mountbatten: Mullaghmore, Year After Year

Sat, 23 May 2026 00:00:00 GMT

Photo credit Z thomas, CC BY-SA 4.0. The Mountbattens had been holidaying at Classiebawn Castle, just above Mullaghmore harbour, for thirty years. The castle had been built for Lord Palmerston in the nineteenth century and had come into the family through Lady Mountbatten's inheritance. Local people knew the family ...

Image: Z thomas | CC BY-SA 4.0

Assassination of Lord Mountbatten: The Morning

Sat, 23 May 2026 00:00:00 GMT

Photo credit Z thomas, CC BY-SA 4.0. Thomas McMahon, an IRA explosives officer from County Monaghan, planted the device on Shadow V during the night of 26-27 August. The bomb contained 50 pounds of gelignite and a radio-controlled detonator. It was placed beneath where Mountbatten was known to sit at the helm. McMah...

Image: Z thomas | CC BY-SA 4.0

Assassination of Lord Mountbatten: Warrenpoint

Sat, 23 May 2026 00:00:00 GMT

Photo credit Z thomas, CC BY-SA 4.0. Five hours after the Mullaghmore bomb, on the east coast near the border, the IRA's South Armagh Brigade detonated a 500-pound roadside bomb beside a British Army convoy at Narrow Water Castle outside Warrenpoint, County Down. Six soldiers of the Parachute Regiment were killed in...

Image: Z thomas | CC BY-SA 4.0

Assassination of Lord Mountbatten: Trial and Aftermath

Sat, 23 May 2026 00:00:00 GMT

Photo credit Z thomas, CC BY-SA 4.0. Forensic tests found traces of nitroglycerine and ammonium nitrate, two of gelignite's ingredients, on the clothing of both McMahon and McGirl. Investigators recovered flakes of green and white paint from McMahon's boots and jacket - matching Shadow V exactly - and sand from Mull...

Image: Z thomas | CC BY-SA 4.0

Assassination of Lord Mountbatten: What Remains

Sat, 23 May 2026 00:00:00 GMT

Photo credit Tony Webster from Portland, Oregon, United States, CC BY 2.0. Pope John Paul II, who was preparing to visit Ireland and had planned to cross the border to Armagh, cancelled the Northern Ireland part of his trip in response to what the Vatican called "the brutal crimes" of that day. He described the killings as "an insult to human dignity." ...

Image: Tony Webster from Portland, Oregon, United States | CC BY 2.0