Violence erupts after the Apprentice Boys of Derry march in Derry, Northern Ireland, resulting in a three-day communal riot known as the Battle of the Bogside.

The Apprentice Boys of Derry is a Protestant fraternal society founded in 1814 and based in the city of Derry, Northern Ireland. In 2021 it had over 10,000 members worldwide, with membership open to Protestant men only. There are branches elsewhere in Northern Ireland, Ireland, Scotland, England, Australia and Canada. The society aims to commemorate the 1689 Siege of Derry when Catholic James II of England and Ireland and VII of Scotland laid siege to the walled city, which was at the time a Protestant stronghold. Apprentice Boys parades once regularly led to virulent opposition from the city's Irish nationalist majority, but recently a more conciliatory approach has taken place and now the parades are virtually trouble-free. The 2014 'Shutting of the Gates' parade was described as "the biggest in years" and was violence-free.

Derry, officially Londonderry, is the second-largest city in Northern Ireland, and the fifth-largest on the island of Ireland. Located in County Londonderry, the city now covers both banks of the River Foyle. Cityside and the old walled city being on the west bank and Waterside on the east, with two road bridges and one footbridge crossing the river in-between.

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, and sealed off the neighbourhood to authorities. 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.