 Ramba uchinyora ndima iyi - IRA yokutanga yakaumbwa muna 1913 seIrish Volunteers, panguva apo Ireland yose yaiva rutivi rweUnited Kingdom. Vazvipiri vakatora rutivi Mukumukira kweIsitaKurwisana nokutonga kweBritain muna 1916, uye Hondo yeRusununguko yakatevera Chirevo cheRusununguko neparamende yeDáil Éireann muna 1919, panguva iyo vakazozivikanwa seIRA. Ireland yakakamurwa kuva Southern Ireland neNorthern Ireland neGovernment of Ireland Act 1920, uye zvichitevera kuitwa kweAnglo-Irish Chibvumirano muna 1922 Southern Ireland, yakatumidzwa zita reIrish Free State, yakava hutongi hwekuzvitonga apo Northern Ireland yakasarudza kuramba iri pasi pekutonga kwemusha sechikamu cheUnited Kingdom. Chibvumirano ichi chakakonzera kupatsanuka muIRA, IRA yaitsigira Chibvumirano ichi yakanyudzwa muNational Army, iyo yakakunda IRA yaipikisa Chibvumirano muHondo yeVanhu. Gare gare, apo vachiramba huchokwadi hweFree State, zvinhu zvakapona zveAnti-Treaty IRA zvakanangana nekuparadza nyika yeNorthern Ireland uye kubudirira kweUnited Ireland, kuita bhomba rekurwisa muEngland muna 1939 na1940, mushandirapamwe muNorthern Ireland muma1940, uye mushandirapamwe weBorder wa19561962. Pashure pokukundikana kweBorder campaign, gakava romukati rakaitika pamusoro penguva yemberi yeIRA. Chief-of-staff Cathal Goulding aida kuti IRA igamuchire hurongwa hwezvematongerwe enyika uye inopinda mune zvematongerwe enyika, nepo maRepublican echinyakare saSeán Mac Stíofáin aida kuwedzera kuunganidza uye kuvakazve IRA. 