The Battle of the Bogside was a large three-day riot that took place from 12 to 14 August 1969 in Derry, Northern Ireland. Thousands of Catholic/Irish nationalist residents of the Bogside district, organised under the Derry Citizens' Defence Association, clashed with the Royal Ulster Constabulary (RUC) and loyalists. It sparked widespread violence elsewhere in Northern Ireland, led to the deployment of British troops, and is often seen as the beginning of the thirty-year conflict known as the Troubles.