 Complete the following phrase:  Following an eighth-place finish in the 196970 season and a poor start to the 197071 season, Busby was persuaded to temporarily resume managerial duties, and McGuinness returned to his position as reserve team coach. In June 1971, Frank OFarrell was appointed as manager, but lasted just 18 months before being replaced by Tommy Docherty in December 1972. Docherty saved Manchester United from relegation that season, only to see them relegated in 1974. By that time, the trio of Best, Law and Charlton had left the club. The team won promotion at the first attempt and reached the FA Cup final in 