Violence erupts after the <a href="https://en.wikipedia.org/wiki/Apprentice_Boys_of_Derry" id="mw1g" rel="mw:WikiLink" title="Apprentice Boys of Derry">Apprentice Boys of Derry</a> march in <a href="https://en.wikipedia.org/wiki/Derry" id="mw1w" rel="mw:WikiLink" title="Derry">Derry, Northern Ireland</a>, resulting in a three-day communal riot known as the <a href="https://en.wikipedia.org/wiki/Battle_of_the_Bogside" id="mw2A" rel="mw:WikiLink" title="Battle of the Bogside">Battle of the Bogside</a>.