Manchester United play their fifth Portuguese side in European competition as they take on Braga in tonight's Champions League clash, continuing a love affair with the Iberian clubs.

Since their first trek to Portugal in 1966 when George Best scored twice in a stunning 5-1 victory over two-time European Cup winners Benfica, supporters have have enjoyed fond memories of trips to Portugal and endured some frightening ones too.

Wins at Benfica in 2006, Sporting Lisbon the following year and a superb 1-0 win away to Porto rank highest, but there is a darker side which few remember.

The treatment of travelling United fans in Oporto in 1997 is one of the most shocking English football fans have experienced abroad. Over 30 were hospitalised, several were shot, many batoned and many more were tear gassed. There was also a near-Hillsborough crush at the stadium gate.

Away from the unsettling incidents in 1997, here's a gallery of United in Portugal...

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  • United in Lisbon, 1966 From left: Connelly, Charlton, Gregg, Crerand, Busby, Herd, Stiles, Law, Dunne, Best, Brennan, Foulkes

  • George Best celebrates his and United's first in a 5-1 demolition of Benfica, 1966

  • Bobby Charlton is mobbed after the Benfica win

  • El Beatle: Best back in Britain after his Benfica brilliance

  • Porto, 1997

  • Boavista, 2002

  • A young Cristiano Ronaldo impresses in a 2003 friendly to open Sporting Lisbon's Jose Alvalade Stadium

  • Keane's about to see red at Porto, 2004

  • Pre-season training, 2004 From left: Ronaldo, Kléberson, Miller, O'Shea, Van Nistelrooy, Keane, Fortune, Phil Neville, Giggs and Scholes

  • Disaster versus Benfica, 2005

  • Atoning versus Benfica, 2006

  • Ronaldo scores on his homecoming, 2007

  • Ronaldo hits his greatest United goal past Porto, 2009

  • Ryan Giggs equalises in Benfica's Estadio da Luz, 2011

No images from the 1977 match away to Porto are available.