sentences:  In June 1922, after the Four Courts garrison had kidnapped J.J. O'Connell, a general in the new Free State Army, Collins shelled the Four Courts with borrowed British artillery in what became known as the Battle of Dublin.O'Connor surrendered following two days of fighting, and Barrett with 200 or so anti treaty IRA members, was arrested and held in Mountjoy Gaol Prison.This incident sparked the Irish Civil War – as fighting broke out around the country between pro and anti treaty factions.