The Provisional Irish Republican Army (IRA) ambushes two British Army Land Rovers with an improvised land mine outside Dungannon, County Tyrone, Northern Ireland, on December 16, 1979. Four British soldiers are killed in the attack.

Since the beginning of its campaign in 1970, the Provisional IRA has carried out many improvised land mine and roadside bomb attacks on British forces in the region. In September 1972, three British soldiers are killed when their armoured vehicle is blown up by an IRA land mine at Sanaghanroe, near Dungannon. In March 1974, two IRA members are killed on the Aughnacloy Road near Dungannon when a land mine they are planting explodes prematurely.

The Dungannon attack occurs just months after the Warrenpoint ambush on August 27, 1979, where the IRA kills eighteen British soldiers with roadside bombs in south County Down — the deadliest single attack on British forces during The Troubles.

On December 16, 1979, two armoured British Army Land Rovers are driving along Ballygawley Road, about two miles outside Dungannon. A unit of the IRA had planted a 600–1,000-pound (270–450 kg) improvised land mine in a culvert under the road at Glenadush. When the second vehicle reaches the culvert, the land mine is detonated by remote control from a concealed location, showcasing their evolving tactics in guerrilla warfare and ambush strategy. The blast is powerful enough to launch the armoured Land Rover into the air and killing four soldiers from the Royal Regiment of Artillery outright: William Beck (23), Keith Richards (22), Simon Evans (19), and Allan Ayrton (23).