Border campaign (Irish Republican Army)

The Border campaign (12 December 1956 – 26 February 1962) was a guerrilla warfare campaign (codenamed Operation Harvest) carried out by the Irish Republican Army (IRA) against targets in Northern Ireland, with the aim of overthrowing British rule there and creating a united Ireland. It was also referred to as the "resistance campaign" by some Irish republican activists.

Source: Wikipedia — Border campaign (Irish Republican Army) (CC BY-SA 4.0)