Millwall away in 99 I think was living in London at the time - horrible area, horrible fans, broken glass everywhere, fire, injured police and marched flanked by dogs to London bridge station. Huge amount of violence and in truth it didn't really involve the city fans as we were locked in for a very very long time. Over 30 Met officers ended in hospital!
Bizarre thing was when we equalised for 1-1 I barely celebrated as I thought we were 2-0 down as I thought a disallowed goal for them had stood and I couldn't understand the celebrations