sentences:  United played one more friendly during the 2006–07 season, the UEFA Celebration Match on 13 March.The match marked the 50th anniversary of the Busby Babes' first foray into European competition and 50 years since the signing of the Treaty of Rome, the treaty that laid the foundations for what became known as the European Union.The Red Devils took on a European XI, coached by the 2006 World Cup-winning manager Marcelo Lippi.