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Battle of Bogside , Londonderry.Westminister MP Bernadette Devlin is in tears after riot police had fired tear gas into a crowd behind berricades in the bogside area of this city of violence ..Miss Devlin , who won the mid-Derry seat , yesterday protested that a military gas known as CS was being used by Ulster Police . She said it was also used by Americans in Vietnam and issued to Police here by the British Army for use only ' in grave emergency and under strict control '..14th August 1969 (KEYSTONE/United Archives / TopFoto/Personalities)