Nigel Clough was relieved to see Chris Porter score a late penalty to secure the Blades a fourth consecutive Sky Bet League One victory at Colchester United on Tuesday evening.
The Gaffer admitted afterwards that he thought United would have to settle for a point at the Weston Homes Community Stadium, despite a 'dominant' display from the visitors.
He remarked: "It was a thoroughly deserved win in the end, but at half-time I thought we had missed our opportunity because we were so dominant and created numerous chances without converting them.
"I was very pleased with the way we played, although our finishing wasn't great and it certainly would have been two points dropped if we hadn't won the game late on.
"The pitch wasn't ideal and conditions were testing, but we have come away from home, controlled the game and kept a clean sheet, a 0-0 wouldn't have been the end of the world, but a win is fantastic."
On the decisive moment, with three minutes left on the clock, Clough was in no doubt that referee Graham Scott made the correct call in awarding his side a penalty.
The boss added: "We had a good shout for a penalty in the first-half too when Ben (Davies) thought he had been caught so getting the decision when we did was our just reward.
"It was a definite penalty, there were very little complaints from the Colchester players and staff, it was a foul and a yard inside the box."