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Londonderry , Northern Ireland . Riot police , armed with tear gas and carrying protective shields face rioters race rioters on their rooftop stronghold during disturbances. The tricolour of Southern Ireland flies from the top of their stronghold . More than 300 troops of the Prince of Wales's own regiment arrived in the riot-torn city to restore order. The decision to send troops into Derry followed a request by the Ulster Government...15th August 1969 (KEYSTONE/United Archives / TopFoto/General)