A speechless Nigel Clough tried to put his emotions into words after goals from Ryan Flynn and John Brayford ensured the Blades a FA Cup semi-final spot at Wembley next month.
In front of over 30,000 at Bramall Lane, two second-half goals proved crucial in defeating Chris Powell's Charlton Athletic, meaning United can now look forward to a last four showdown at the National Stadium next month.
Speaking in the aftermath of remarkable scenes at the Lane, the Blades boss felt his side were good value for the win against their Championship opponents.
He said: "We are incredibly proud of the players as we have for the last couple of months.
"The last nine matches, culminating in this victory, have been very, very special indeed and this day will never be forgotten by everyone associated with the Club.
"We have achieved this success by sheer hard work, that includes the coaching staff, but it is the players on the pitch that have won us the matches.
"The defeat at Crewe was the turning point, the players knew that performance was unacceptable and from walking off the field at Gresty Road the determination within the group has been terrific.
"We have produced performance after performance and I think we have thoroughly deserved to win each of the last nine matches."
Looking at the key moments of Sunday's encounter, Clough added: "The atmosphere took everyone's breath away and it worked against us early on because we looked a bit nervous and on edge.
"The best players in the world are used to occasions like that, I hope our players will get used to it quickly though because we hope this is the first of many days to remember in the future.
"The missed opportunity from Harriott in the second-half was a small turning point in the game, but gradually we grew into the contest and once we got that opening goal we never looked back.
"It is simply a memorable day and one that we should all enjoy."