 The rivalry between West Ham and Millwall has involved considerable violence and is one of the most notorious within the world of football hooliganism . The teams were drawn against each other in the second round of the 2009 – 10 League Cup and met on 25 August 2009 at Upton Park . This was the first time in four years that the two clubs had played each other , and the first ever in the League Cup . Clashes between fans occurred outside the ground , resulting in violence erupting up to half a mile away from the stadium , with serious injuries , include the stabbing of a Millwall supporter , damage to property and several arrests reported by police . There were also several pitch invasions by West Ham supporters which brought a temporary halt to the game . In January 2010 West Ham were fined £ 115 @,@ 000 after being found guilty of violent , threatening , obscene and provocative behaviour and of failing to prevent their fans entering the field of play . Millwall were cleared of all charges . 
