Séamus McElwaine judge describing him as a "dangerous killer" and recommending he spend at least 30 years in prison. On 25 September 1983, McElwaine was involved in the Maze Prison escape, the largest break-out of prisoners in Europe since World War II and in British prison history. 38 republican prisoners, armed with 6 handguns, hijacked a prison meals lorry and smashed their way out of the Maze prison. After the escape he joined an IRA Active Service Unit operating in the area of the border between Counties Monaghan and Fermanagh. The unit targeted police and military patrols with gun and bomb attacks,
Mountjoy Prison helicopter escape thousand members of the Irish Defence Forces and Garda Síochána ensued. Mallon was recaptured at a Gaelic Athletic Association dance in a hotel near Portlaoise on 10 December 1973, and imprisoned in Portlaoise Prison. He escaped from there in a mass break-out on 18 August 1974, when nineteen prisoners escaped after overpowering guards and using gelignite to blast through the gates. He was recaptured in Foxrock in January 1975 and returned to Portlaoise Prison. O'Hagan was recaptured in Dublin in early 1975, and also imprisoned in Portlaoise Prison. After the end of his original twelve-month sentence, he was immediately arrested