Steve Evans revelled in a memorable occasion as Rotherham christened the New York Stadium with a resounding 3-0 win over Burton.
The Millers raced into an early two-goal lead through Daniel Nardiello and Kayode Odejayi and, after Lee Bell had his Brewers debut ruined by two bookings, Ben Pringle applied gloss to the scoreline 15 minutes from time.
Evans said: "We knew this was going to be a big occasion and a full house and for the first 20 minutes we were outstanding and could have been three or four up.
"To be fair to Burton, they had a real spell in the 20 minutes up to half-time. These guys can play and we were happy to go in at half-time two up.
"I know they went down to 10 men, but I think we were already putting them to the sword at 11 v 11.
"But we know how tough it's going to be and we have to remain as one, in the dressing room and on the pitch, and people will continue to throw bombs into the camp.
"There will be a lot of disappointed people in the country when they see we have won."
Burton boss Gary Rowett said: "We were undone by a long through ball that should have been a throw-in. It was a mistake by the official and a penalty that was a mistake by us.
"I thought after 20 or 25 minutes we started to get our game going and we had five or six chances where balls went across the box that we should have been on the end of.
"I really felt positive at half-time. I felt we started well and if we had dealt with the first few minutes it would have been game on."