United went ahead through Jamie Murphy, before Nicklas Helenius equalised for the hosts. But Ryan Flynn scored a stunning winner for the Blades, who went all the way to the semi-finals of the competition that year before being knocked out by Hull City after extra time at Wembley.
What happened to the Blades XI from that day at Villa Park?
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1. George Long
Made over 100 appearances for the United first-team before leaving in 2018, to join Hull on a permanent basis Photo: Laurence Griffiths
2. Tony McMahon
Right-back McMahon played over 60 times for United after arriving from Middlesbrough. He later played for clubs including Blackpool and Bradford City and is still playing at 34, after signing for National League North side Darlington late last year Photo: James Hardisty
3. Harry Maguire
Came through United's youth academy and was a mainstay of United's side during his time at Bramall Lane before being sold to Hull. Later moved to Leicester before a world-record £80m move to Manchester United. Now captains the Red Devils and is a regular for the England side, too Photo: Steve Parkin
4. Neill Collins
Spent five years at Bramall Lane and made over 200 appearances before cancelling his contract by mutual consent in 2011 to join Tampa Bay Rowdies. Is now the head coach of the USL Championship side Photo: MARTYN HARRISON