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, near Rosslea, County Fermanagh. The IRA unit, firing from the back of an armored dump truck, attacked the small base with heavy machine-guns, grenades, rockets and a flamethrower. A nearby British 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.