Nicky Adams said the Cobblers deserved to progress through to round 4 of the Emirates FA Cup for the first time since 2004.
The Cobblers won 4-2 at Burton on Sunday, and Adams said the result was fully merited.
"It was a deserved win," he said.
"I thought we did well from start to finish. The way we beat Stevenage on New Year's Day gave us a lift after a tough week or two but for the whole squad and the travelling support, Sunday was a superb day for everyone."
Adams was pleased to score his first goal of his second spell for the club, and he joked:
"I said to the lads before the match that I only score in the big games so maybe I was due a goal! I thought we started well, we had a good tempo and it was great to put us ahead.
"I like to get us playing, to help us create chances and I am loving playing wing back this season. Going forward is my main game of course, but I like defending as well and I said to Jordan (Turnbull) on Sunday that we had to make sure nothing came down our side and I thought we did that well.
"Our fourth goal really took the game away from Burton. We were disappointed to concede right on half time, but we knew the next goal was crucial and thanks to some great work from Vadaine and a fine finish from Sam Hoskins, we got that goal.
"John-Joe O'Toole is a great friend of mine and he will be a friend for life but I enjoyed that nutmeg against him in the second half, mind you, he will probably whack me for it now but I enjoyed it!
"The fans were superb on Sunday. No one needs to tell me about our supporters, I remember them from last time and they have been brilliant again. We have had a difficult week or two but 99% of the supporters have stuck with us and Sunday was for them and you don't forget days like that."