London - Discarded striker Danny Welbeck returned to haunt Manchester United by scoring the winning goal as Arsenal reached the FA Cup semi-finals with an enthralling 2-1 victory at Old Trafford on Monday.
England international Welbeck, who joined the Londoners last summer after his United career stalled, pounced on a horrendous back pass by Antonio Valencia in the 61st minute to send the holders through.
In a rip-roaring first half Nacho Monreal's cool finish put Arsenal ahead in the 25th minute but Wayne Rooney's diving header evened it up four minutes later.
United, who will now ponder a second consecutive season without silverware, ended the match with 10 men after Angel Di Maria was red-carded for grabbing the referee's shirt just seconds after being booked for diving.
Meanwhile, the draw for the FA Cup semi-final has taken place after the match.
Draw for the semi-finals of the FA Cup made on Monday (Premier League unless stated):
Bradford City (III) or Reading (II) v Arsenal
Aston Villa v Liverpool or Blackburn Rovers (II)
Ties to be played at Wembley across the weekend of April 18/19