The Drummuckavall ambush was an attack by the South Armagh Brigade of the Provisional Irish Republican Army (IRA) on a British Army observation post in Drummuckavall, southeast of Crossmaglen, County Armagh, on 22 November 1975. The attack, which occurred along the border with the Republic of Ireland, resulted in the deaths of three British soldiers and underlined the inefficiency of conventional military skills to deal with the situation in South Armagh, prompting the deployment of the Special Air Service (SAS) in this area.