Irish Republican Army (1922–1969)

The Irish Republican Army (IRA; Irish: Óglaigh na hÉireann, lit. 'warriors of Ireland') was an Irish republican paramilitary organisation that carried on a number of violent campaigns between 1922 and 1969, in pursuit of a 32-county Irish republic. It arose from a split in the original IRA over the signing of the Anglo-Irish Treaty in December 1921, and was known during the ensuing Civil War as the Anti-Treaty IRA or the "Irregulars".

Source: Wikipedia — Irish Republican Army (1922–1969) (CC BY-SA 4.0)