Bloody Sunday or Belfast's Bloody Sunday was a day of violence in Belfast, Northern Ireland on 10 July 1921, during the Irish War of Independence. The violence erupted one day before a truce began, which ended the war in most of Ireland. With the truce nearing, police launched a raid against republicans, but were ambushed by the Irish Republican Army (IRA) and an officer was killed. In retaliation, Protestant loyalists attacked Catholic enclaves in west Belfast, burning homes and businesses. This sparked rioting and gun battles between Protestants and Catholics, including paramilitaries. There were also gun battles between republicans/nationalists and the police, and some police patrols fired indiscriminately at Catholic civilians. Seventeen people were killed or fatally wounded on 10 July