Glenanne barracks bombing
The Glenanne barracks bombing was a large truck bomb attack carried out by the Provisional IRA against a British Army (Ulster Defence Regiment) base at Glenanne, near Mountnorris, County Armagh. The driverless lorry was rolled down a hill at the rear of the barracks and crashed through the perimeter fence.
Source: Wikipedia — Glenanne barracks bombing (CC BY-SA 4.0)