Proud Peterborough boss Grant McCann hailed his players following arguably the finest night of his managerial career.
Posh sank fierce rivals Northampton 3-0 in the clubs' first meeting for seven years to close to within a point of the League One play-off places.
Shaquile Coulthirst grabbed his first goal of the season to set them on the way before a Zander Diamond own goal and a Tom Nichols volley sealed the win.
McCann said: "It was the sort of performance we have grown used to down the years and it has really set our benchmark for the rest of this season.
"I would have loved to have played in a Posh versus Northampton game, and it was great to win one as a manager.
"Winning individual battles is crucial in derby games and my players did all over the pitch.
"I'm delighted for Shaq and Tom to get goals after taking a bit of flak at times, and also for my back four and goalkeeper who really deserved the clean sheet. Credit goes to all the boys.
"It was also great to see a big crowd and the fans give the lads a huge lift. Hopefully we did enough to persuade them to come back on a regular basis."
Northampton boss Rob Page said: "I can only apologise to the fans who travelled.
"They had every right to show their frustration at full-time and I've just done the same to the players in the dressing room.
"We knew Peterborough would have a lot of the ball and we knew we had to be disciplined in our defending.
"We left ourselves with a mountain to climb after conceding from two set-pieces. That is not like us and is quite simply unacceptable.
"We changed the shape and were on top for a large part of the second half, but we couldn't take any of the chances that came our way.
"We'll be working hard to put it right and hopefully that will happen on Saturday."