From Wikipedia

Brits Part 2 - Shoot to Kill

"The Troubles" refers to approximately three decades of violence between elements of Northern Ireland's nationalist community (principally Roman Catholic) and unionist community (principally Protestant). Use of the term "the Troubles" has been raised at Northern Ireland Assembly level, as some people considered this period of conflict to have been a "war". The conflict was the result of discrimination against the Catholic/nationalist minority by the Protestant/unionist majority and the question of Northern Ireland's status within the United Kingdom. The violence was characterised by the armed campaigns of paramilitary groups, including those of the Provisional Irish Republican Army (IRA) campaign of 1969–1997, intended to end British rule in Northern Ireland and to reunite Ireland politically and thus creating a new "all-Ireland" Irish Republic; and of the Ulster Volunteer Force, formed in 1966 in response to the perceived erosion of both the British character and unionist domination of Northern Ireland. The state security forces—the British Army and the Royal Ulster Constabulary (RUC)—were also involved in the violence.