Iron manager Graham Alexander was delighted with his side's resolve as they withstood late pressure to seal their first three points on the road this season.
United were in pole position at the interval thanks to Tom Hopper's header and a Josh Morris penalty, but a bombardment in the second half saw the home team rally but to no avail.
"It was a massive win for us tonight," he told The Iron PlayerHD.
"This is a really tough place to come and take points from. I've learnt that in the past and we had to face a big bombardment in the second half.
"Our play in the first half was superb and we mixed our play up and we created so many opportunities. You just want to take every one if you're being greedy because you know they're going to have a spell where they will put us under pressure and that happened for a lot of the second half.
"It turned into a real physical battle and I thought every single player did that (battle) tonight. It was a massive three points."
Labelled as a "dominant first half display", the Iron were good value for their opening half lead and might have had more through Luke Williams, Kevin van Veen and Morris.
"To go in 2-0 up at half time, we were delighted with," he continued.
"The first goal was an unbelievable cross and finish and the second was a deserved penalty to keep his composure and put it away.
"You knew there was going to be a reaction and they make it a hostile environment. We especially had to stand up to that.
"Every single player showed everything that is required in a winning football team.
"We used our intelligence and quality in the first half and in the second half we had to put our balls on the table and that's what we did."
Scunthorpe lost Williams at the interval through injury, with Hakeeb Adelakun on in his place. The winger was replaced late on for Charlie Goode to come on and supplement the defence, with the Iron boss giving his thoughts on the alteration.
"He hurt his foot in a tackle in the first half," stated Alexander.
"It was quite early on and to be fair he played really well. He was asking for painkillers and Chris Burton (physio) told me it was only going to get worse and he could do some more damage so we made the change.
"I brought Haks (Hakeeb Adelakun) but unfortunately I had to take him off. It was my mistake and the way the game panned out it wasn't one for good football and skills. I said that to the boys and I've said that to Hakeeb because I wouldn't want to do that to any professional footballer, but it was my mistake and I have to stand up and make the change.
"Charlie (Goode) came on because we needed a team on the pitch that could compete aerially with what Wimbledon were throwing at us."
Evaluating the victory as a whole, Alexander hailed his side following seven points from the first nine games and a real will to win.
"It's a great group and they're all backing each other," he stated.
"The atmosphere in the dressing room after the game was superb. They're all supporting each other to win games and that's important. The players know that they have to compete every day and every game to keep their place in the team and I'm delighted with every player that has taken part in all four games so far.
"We've got three points now, so we'll put them in the pocket and go again on Saturday."
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