In pictures:The Arsenal-Man Utd rivalry
Battle of 1990

A 21-man brawl breaks out during Arsenal's 1-0 victory at Old Trafford in October 1990.

A Football Association disciplinary committee later fines both clubs 50,000. Manchester United have a point deducted, while Arsenal are docked two points.

The infamous incident signals the start of an often bitter rivalry between the two clubs.

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