The Flagstaff Hill incident was an international incident between the Republic of Ireland and the United Kingdom. It took place on the night of 5/6 May 1976 near Cornamucklagh, a townland just inside the Cooley Peninsula in the north of County Louth in the Republic of Ireland, when the Irish Army and Garda Síochána arrested eight British Special Air Service soldiers who had illegally crossed the Irish border.
The worsening security situation in south County Armagh, especially after the killing of three British soldiers at an observation post in November 1975 and the massacre of ten Protestant workers in January 1976, prompted British PM Harold Wilson to publicly acknowledge the presence of D squadron of the Special Air Service , which was deployed to Bessbrook Mill. The ambush of the observation post exposed the fact that conventional military tactics hadn't worked for the British Government in South Armagh, since the British Army report of this incident identified a number of basic mistakes regarding camouflage, routine patterns and the observation post's arrangement.
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