On the 18th of April, 1980, Private Thomas Barrett and Private Derek Smallhorne were murdered and one soldier, Private John O’Mahony was seriously injured in the same incident in Lebanon. The personnel were serving as peacekeepers with the United Nations Interim Force in Lebanon (UNIFIL). At the village of At-Tiri, a convoy, which included the three Irish soldiers, was stopped and all the personnel were taken prisoner by de-facto forces. The Defence Forces personnel were disarmed and separated from the rest of the group. Private O’Mahony was shot and seriously injured while Privates Barrett and Smallhorne were murdered.