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. Violence broke out as the Protestant loyalist Apprentice Boys marched past the Catholic Bogside. The RUC drove back the Catholic crowd and pushed into the Bogside, followed by loyalists who attacked Catholic homes. Thousands of Bogside residents beat back the RUC with a hail of stones and petrol bombs. The besieged residents built barricades, set up first aid posts and petrol bomb workshops, and a radio transmitter broadcast messages calling for resistance. The RUC fired CS gas into the Bogside – the first time it had been used by UK police. Residents feared the Ulster Special Constabulary would be sent in and would massacre Catholic residents. The Irish Army set up field hospitals near the border and the Irish government called for a United Nations peacekeeping force to be sent to Derry. On 14 August, the British Army were deployed and the RUC were withdrawn. The British Army made no attempt to enter the Bogside, which became a no-go area called Free Derry. This situation continued until October 1969 when military police were allowed in. Background Tensions had been building in Derry for over a year before the Battle of the Bogside. In part, this was due to long-standing grievances held by much of the city's population. The city had a majority Catholic and nationalist population. In 1961, for example, the population was 53,744, of which 36,049 was Catholic and 17,695 Protestant. However, because of gerrymandering after the partition of Ireland, it had been ruled by the Ulster Unionist Party since 1925. Nationalist grievances Unionists maintained political control of Derry by two means. Firstly, electoral wards were gerrymandered so as to give unionists a majority of elected representatives in the city. The Londonderry County Borough, which covered the city, had been won by nationalists in 1921. It was recovered by unionists, however, following re-drawing of electoral boundaries by the unionist government in the Northern Ireland Parliament. Secondly, only owners or tenants of