The Mountjoy Prison helicopter escape occurs on October 31, 1973, when three Provisional Irish Republican Army (IRA) volunteers escape from Mountjoy Prison in Dublin aboard a hijacked Alouette II helicopter, which briefly lands in the prison’s exercise yard. The escape makes headlines around the world and is an embarrassment to the Irish coalition government of the time, led by Fine Gael‘s Liam Cosgrave, which is criticised by opposition party Fianna Fáil. A manhunt involving twenty thousand members of the Irish Defence Forces and Garda Síochána is launched for the escapees, one of whom, Seamus Twomey, is not recaptured until December 1977. The Wolfe Tones write a song celebrating the escape called “The Helicopter Song,” which tops the Irish Singles Chart.

Following the outbreak of the Troubles in the late 1960s, the Provisional IRA conducts an armed campaign that seeks to create a united Ireland by ending Northern Ireland‘s status as part of the United Kingdom. As a result of increasing levels of violence in Northern Ireland, internment without trial is introduced there in August 1971, and in the Republic of Ireland the coalition government led by Fine Gael’s Liam Cosgrave is attempting to curb IRA activity. Fine Gael had come to power on a law-and-order ticket, with a policy of “getting tough on crime.” Suspected IRA members are arrested and accused of IRA membership by a superintendent in the Garda Síochána, a crime under the Offences against the State Acts. They are tried at the juryless Special Criminal Court in Dublin, where the traditional IRA policy of not recognising the court results in a fait accompli as no defence is offered and IRA membership carries a minimum mandatory one-year sentence, resulting in internment in all but name. In September 1973 IRA Chief of Staff Seamus Twomey appears at the Special Criminal Court charged with IRA membership, and states, “I refuse to recognise this British-orientated quisling court.” He is found guilty and receives a five-year sentence. By October 1973 the IRA’s command structure is seriously curbed, with Twomey and other senior republicans J. B. O’Hagan and Kevin Mallon all being held in Mountjoy Prison.

The IRA immediately begins making plans to break Twomey, O’Hagan and Mallon out of the prison. The first attempt involves explosives that had been smuggled into the prison, which are to be used to blow a hole in a door which will give the prisoners access to the exercise yard. From there, they are to scale a rope ladder thrown over the exterior wall by members of the IRA’s Dublin Brigade who are to have a getaway car waiting to complete the escape. The plans when the prisoners cannot gain access to the exercise yard and the rope ladder is spotted, so the IRA begins making new escape plans. The idea of using a helicopter in an escape had been discussed before in a plot to break Gerry Adams out of Long Kesh internment camp but had been ruled out because of faster and more sophisticated British Army helicopters being stationed at a nearby base. The IRA’s GHQ staff approves the plan to break out Twomey, O’Hagan and Mallon, and arrangements are made to obtain a helicopter. A man with an American accent calling himself Mr. Leonard approaches the manager of Irish Helicopters at Dublin Airport, with a view to hiring a helicopter for an aerial photographic shoot in County Laois. After being shown the company’s fleet of helicopters, Leonard arranges to hire a five-seater Alouette II for October 31.

Leonard arrives at Irish Helicopters on October 31 and is introduced to the pilot of the helicopter, Captain Thompson Boyes. Boyes is instructed to fly to a field in Stradbally, in order to pick up Leonard’s photographic equipment. After landing Boyes sees two armed, masked men approaching the helicopter from nearby trees. He is held at gunpoint and told he will not be harmed if he follows instructions. Leonard leaves with one gunman, while the other gunman climbs aboard the helicopter armed with a pistol and an ArmaLite rifle. Boyes is instructed to fly towards Dublin following the path of railway lines and the Royal Canal and is ordered not to register his flight path with Air Traffic Control. As the helicopter approaches Dublin, Boyes is informed of the escape plan and is instructed to land in the exercise yard at Mountjoy Prison.

In the prison’s exercise yard, the prisoners are watching a football match. Shortly after 3:35 p.m. the helicopter swings in to land in the prison yard, with Kevin Mallon directing the pilot using semaphore. A prison officer on duty initially takes no action as he believes the helicopter contains the Minister for Defence, Paddy Donegan. After prisoners surround the eight prison officers in the yard, fights break out as the officers realise an escape attempt is in progress. As other prisoners restrain the officers, Twomey, Mallon and O’Hagan board the helicopter. As the helicopter takes off, in the confusion one officer shouts, “Close the gates, close the fucking gates.” The helicopter flies north and lands at a disused racecourse in the Baldoyle area of Dublin, where the escapees are met by members of the IRA’s Dublin Brigade. Boyes is released unharmed, and the escapees are transferred to a taxi that had been hijacked earlier and are transported to safe houses.

The escape makes headlines around the world and is an embarrassment for Cosgrave’s government, which is criticised for “incompetence in security matters” by opposition party Fianna Fáil. An emergency debate on security is held in Dáil Éireann on November 1.

The IRA releases a statement on the escape, which reads, “Three republican prisoners were rescued by a special unit from Mountjoy Prison on Wednesday. The operation was a complete success, and the men are now safe, despite a massive hunt by Free State forces.” Shortly after the escape Twomey gives an exclusive interview to German magazine Der Spiegel, where the reporter says people throughout Europe are joking about the incident as “the escape of the century.” Irish rebel band the Wolfe Tones writes a song celebrating the escape called “The Helicopter Song,” which is immediately banned by the government yet still tops the Irish Singles Chart after selling twelve thousand copies in a single week.

The escape results in all IRA prisoners being held at Mountjoy Prison and Curragh Camp being transferred to the maximum security Portlaoise Prison. In order to prevent any further escapes, the perimeter of the prison is guarded by members of the Irish Army, and wires are erected over the prison yard to prevent any future helicopter escape. Cosgrave states there will be “no hiding place” for the escapees, and a manhunt involving twenty thousand members of the Irish Defence Forces and Garda Síochána ensues.

Mallon is recaptured at a Gaelic Athletic Association dance in a hotel near Portlaoise on December 10, 1973, and imprisoned in Portlaoise Prison. He escapes from there in a mass break-out on August 18, 1974, when nineteen prisoners escape after overpowering guards and using gelignite to blast through the gates. He is recaptured in Foxrock in January 1975 and returned to Portlaoise Prison. O’Hagan is recaptured in Dublin in early 1975, and also imprisoned in Portlaoise Prison. After the end of his original twelve-month sentence, he is immediately arrested and sentenced to a further two years imprisonment for escaping. Twomey evades recapture until December 2, 1977, when he is spotted sitting in a car in Sandycove by members of the Garda’s Special Branch who are investigating an arms shipment after a tip-off from police in Belgium. He drives away after spotting the officers, before being recaptured in the centre of Dublin after a high-speed car chase. He is also imprisoned in Portlaoise Prison until his release in 1982.

In 2021, Brendan Hughes publishes an autobiography Up Like a Bird, an account of the planning and organisation of the escape, co-authored with Doug Dalby.