 Over the next three months there were violent clashes , with local youths throwing stones at police . Violence came to a head on Saturday , 19 April after a planned march from <unk> Bridge to the city centre was banned . A protest in the city centre led to clashes with " <unk> " — unionists in sympathy with the anti @-@ civil rights stance of Ian Paisley . Police attempting to drive the protesters back into the <unk> were themselves driven back to their barracks . A series of pitched battles followed , and barricades were built , often under the supervision of <unk> Devlin , newly elected MP for Mid Ulster . Police pursuing <unk> broke into a house in William Street and severely beat the <unk> , Samuel <unk> , his family and two friends . <unk> was brought to hospital " bleeding <unk> from a number of head wounds . " At midnight four hundred <unk> men in full riot gear and carrying riot shields occupied the <unk> . <unk> of police vehicles drove through the area with <unk> <unk> . 
