On 13 December 1989 the Provisional Irish Republican Army (IRA) attacked a British Army permanent vehicle checkpoint complex manned by the King's Own Scottish Borderers (KOSB) near the Northern Ireland–Republic of Ireland border at Derryard, north of Rosslea, County Fermanagh. The IRA unit, firing from the back of an armoured dump truck, attacked the small base with heavy machine-guns, grenades, rockets and a flamethrower. A nearby Army patrol arrived at the scene and a fierce firefight erupted. The IRA withdrew after leaving a van bomb inside the complex, but it did not fully detonate. The assault on the outpost left two soldiers dead and two wounded.