Bayern held by resurgent Man United
Manchester United's Serbian defender Nemanja Vidic (R) scores the opening goal during the UEFA Champions League quarter-final first leg football match between Manchester United and Bayern Munich at Old Trafford in Manchester on April 1, 2014 - by Andrew Yates
Bayern midfielder Bastian Schweinsteiger cancelled out Nemanja Vidic's opener, but was then sent off in the dying stages to give United extra hope ahead of next week's return leg in Munich.
With Bayern having already successfully defended their Bundesliga title and United floundering domestically, the English champions were given little chance of success in the first leg, but they turned in a laudably dogged performance on a night that stirred old passions at Old Trafford.
David Moyes's side defended manfully and after Danny Welbeck had squandered a gilt-edged opportunity late in the first half, they took a 58th-minute lead through Inter Milan-bound captain Vidic.
Schweinsteiger equalised nine minutes later, but United managed to preserve their unbeaten home record in this season's competition, thereby breathing fresh life into a hitherto bleak campaign.
Ten points below the Premier League's top four, United probably need to win the Champions League to qualify for next season's competition, but their courageous display suggested that that may not be as fanciful a notion as previously thought.
The draw also prevented Bayern from setting a new Champions League record of eight successive away wins, but Pep Guardiola's side will nonetheless be the favourites to progress ahead of the return game in Munich.
United set out to contain, with Michael Carrick, Marouane Fellaini and Ryan Giggs in central midfield, but they had the ball in Bayern's net in the third minute.
Welbeck showed great skill to flick the ball over Javi Martinez and fire home, but because the Bayern defender lowered his head in the challenge, the United forward was penalised for a high foot.
Wayne Rooney gave United's fans further encouragement when he forced Bayern goalkeeper Manuel Neuer into a rushed clearance that went out for a throw, but bit by bit, the visitors took control.
- Welbeck fluffs his lines -
Franck Ribery put a cross marginally too far behind Thomas Mueller, while Arjen Robben twice threatened after cutting onto his left foot, with one shot flying wide and the other drawing a flying save from David de Gea.
The hosts spent most of the first half watching Bayern string passes across the face of their penalty area, but in the 40th minute they let a huge chance to take the lead go begging.
Jerome Boateng's inability to cut out a through ball from Rooney left Welbeck one-on-one with Neuer, but he elected for a scooped finish that he miscued, allowing the Germany number one to make a comfortable save.
Undaunted, United pressed on, with Antonio Valencia seeing a shot deflected over, and although Bayern enjoyed 78 percent of possession in the first half, the home side were holding their own.
United introduced Shinji Kagawa for Giggs at half-time and after Schweinsteiger had put a warning shot over De Gea's bar, the hosts went ahead.
Rooney arced a corner towards the back post from the left flank and the unmarked Vidic strained his neck to steer the ball into the bottom-right corner with the side of his head.
Guardiola responded by introducing Mario Mandzukic for Thomas Mueller and the move paid swift dividends, with the Croatian heading down Rafinha's cross for Schweinsteiger to crash an equaliser into the top-left corner.
An injury to Alexander Buttner then forced United into a defensive reshuffle, but although Robben twice went close in the latter stages, Moyes's side held firm.
Guardiola, meanwhile, must contend without the influential Schweinsteiger in Munich next week, after he was shown a second yellow card for sliding in on Rooney in the last minute.