Celtic's rivalry with Hamburg stems from a 2009 Europa League clash, triggered by the unveiling of a Union Jack tifo supporting loyalist sentiments, igniting Celtic’s historical Irish republican connections.
The footballing hostility between Australia and Uruguay began in 1974 with violent pre-World Cup matches, resulting in severe injuries, marking a long-standing rivalry intensified by subsequent World Cup qualification play-offs.
The rivalry between Leeds United and Millwall intensified during the 2007/08 League One season, leading to clashes between fans and police, establishing a heavily policed atmosphere for future encounters.
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