On August 27, 1979, Lord Louis Mountbatten was lobster-potting aboard his boat Shadow V off Mullaghmore in Co Sligo when an IRA bomb exploded, killing him along with his grandson Nicholas and Paul Maxwell, a 15-year-old crew member from Enniskillen in Co Fermanagh. The attack drew international outrage, with President Jimmy Carter voicing his profound sadness, and Thomas McMahon, who planted the device, was arrested at a Garda checkpoint in County Longford.
Mountbatten was lobster-potting aboard his boat, Shadow V, when an IRA bomb exploded, killing Mountbatten, his grandson Nicholas, and Paul Maxwell, a 15-year-old crew member from Enniskillen in County Fermanagh.
The attack provoked international outrage, with then-American President Jimmy Carter expressing his "profound sadness."
The IRA claimed responsibility for the attack, and Thomas McMahon, who planted the bomb, was arrested at a Garda checkpoint in County Longford.
Mountbatten was buried after a ceremonial funeral at Westminster Abbey on September 5, 1979, an event watched by thousands and attended by diplomats from around the world.
On the same day that Mountbatten was killed, the IRA ambushed a British Army convoy with two roadside bombs outside Warrenpoint in Northern Ireland in an incident that became known as the Warrenpoint Massacre.
The attack, which killed 18 members of the Parachute Regiment and wounded 20 more, was the deadliest attack on British soldiers during the Troubles. An English civilian was also killed by the British Army after they opened fire following the explosion, while an Irish civilian also suffered injuries.
The IRA claimed the attack was revenge for Bloody Sunday, which was carried out in Derry in 1972 by the Parachute Regiment.
The regiment suffered the largest number of casualties since the Second World War during the attack at Warrenpoint, for which no one has ever been successfully charged.
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Who was Lord Louis Mountbatten, and why was he a target for Irish republicans?
An uncle of Prince Philip and a second cousin once removed of Queen Elizabeth II, Mountbatten was a man of monstrous vanity and had reportedly been a target of the Provisional IRA long before his assassination in 1979.
The IRA, for instance, allegedly planned to shoot Mountbatten aboard his boat a year earlier, but fog prevented the sniper from taking the shot.
Mountbatten's exploits in the British Navy, coupled with his ties to the British monarchy and British politics, made him a somewhat obvious target for a terrorist group desperate to send a message to the British Government.
Mountbatten was a war hero during the Second World War, rising to the rank of Supreme Allied Commander in the Southeast Asia Theater and overseeing the recapture of Burma and Singapore from Japanese forces.
His experience and exploits in Southeast Asia led to his appointment as Viceroy of India in 1947. As Viceroy, Mountbatten was charged with running India in the name of the British Monarchy and overseeing the transition from British rule to Indian independence by June 30, 1948.
Mountbatten sought to grant India independence more quickly, arguing that the situation was too volatile to wait a year and concluding that a united India was additionally unachievable.
The Viceroy was instructed to create a unified India without partition, but he concluded that a united India was unachievable, and so he set about planning for two independent nations: Hindu-dominated India and Muslim-dominated Pakistan.
India and Pakistan gained independence on August 15, 1947, almost a year earlier than the British had initially planned, and Mountbatten thus went down in history as the last Viceroy of India.
He remained in New Delhi for ten months as Governor-General before returning to the British Navy to serve as Vice-Admiral.
After a long career in the Navy, Mountbatten became Chief of the Defense Staff, the professional head of the British armed forces and the most senior military advisor in uniform to the British Secretary of Defense.
He served in the position for six years and was later allegedly involved in a plot to undermine Labour Prime Minister Harold Wilson in 1968. Mountbatten allegedly met with British press baron Cecil King and Solly Zuckerman, the British Government's chief scientific adviser, as part of a secret campaign to undermine the Labour Government. The campaign reportedly involved up to 30 Secret Service agents.
Allegations
Although he was married to Edwina Cynthia Annette Ashley, Mountbatten faced allegations of homosexuality, with his former driver alleging that he frequently visited a gay brothel in Rabat, Morocco, in 1948.
Far more serious were the allegations of sexual abuse, with an FBI file on Mountbatten containing a report from American author Elizabeth Wharton Drexler that Mountbatten "had a perversion for young boys."
Norman Nield, meanwhile, Mountbatten's driver from 1942 to 1943, told the New Zealand Herald that he regularly transported 12-year-old boys to Mountbatten and was paid to keep quiet.
Several former residents of Kincora Boys Home in Belfast have additionally claimed that they were sent to Mountbatten's residence at Mullaghmore, County Sligo, as part of a sex trafficking ring.
It was at Mullaghmore that Mountbatten met his fate in 1979.
* Originally published in 2020 and updated in 2026.