Nigel Clough praised his players' concentration and resolve, following the thrilling FA Cup fourth round replay success over Fulham on Tuesday night.
Substitute Shaun Miller headed home a dramatic winner in the dying stages of extra-time to secure the Blades a last 16 home tie against the winners of the replay between Nottingham Forest and Preston North End.
Speaking in the aftermath of the victory at Craven Cottage, Clough remarked: "It was a truly remarkable effort again, from start to finish, in the end the winner was richly deserved.
"We were so disappointed on Saturday, but we had a lengthy chat with the players on Monday prior to departing for London and in the end we accepted it was probably just a one-off, a bad day at the office.
"We could see the players were determined to banish the memories of Crewe and what a job they did again in the FA Cup.
"We kept Fulham at bay throughout normal time and extra time and I think we all had the feeling that we would nick it whether that was how we did or on penalties.
"The longer the game went on the more frustrated Fulham looked and it isn't easy when you are struggling and not winning football matches."
The Gaffer concluded by praising the tremendous support United received in the capital, he continued:
"What a night for our 2,000 plus fans, who made the long trip south on a dreadful evening. I don't think they stopped singing all night and again in the dressing room afterwards the players were all saying how that backing gave them that extra ounce of energy when a number of lads were clearly running on empty.
"It is a cliche but the continued support on nights like this make the difference and I thought it was a terrific gesture by the Club to put on 23 free coaches as a reward for their support throughout the season to date."