In a bad-tempered 1-1 draw, City's Tony Vaughan and Millwall's Paul Shaw were dismissed in the 60th minute after clashing over a 50-50 ball. Immediately, several Millwall players piled into the fray and then City players became involved.
Six players were booked - three from each side - and a furious City manager, Joe Royle, said: "The home fans were refereeing at times." He then claimed that some of his players had been spat at and threatened.
Millwall took the lead a minute after half-time, but Lee Bradbury earned a point for City in the last minute.
Huddersfield stayed alongside Sunderland at the top of the First Division after a 1-1 draw at Stockport. Wayne Allsion's eighth goal of the season gave the Terriers an early lead, but Ian Moore scored his first goal for Stockport since his pounds 800,000 move from Nottingham Forest to deprive Huddersfield of the chance to go top.Reuse content