A lively clash saw Wayne Rooney's Rams take the lead in the 77th minute, but the Posh fought back superbly, with teenager Harrison Burrows equalising in the 91st minute, before Siriki Dembele sent the Peterborough fans into hysteria by scoring the winner in the tenth minute of stoppage time.
Speaking after the game, super-sub Burrows gave his insight into the dramatic win, and revealed: “The manager just sent me on to try and change the game.
“He told me to stay high and play more as a winger than a wing-back. He wanted me to try and make an impact by scoring or creating a goal.
“He told me to get in the game as quickly as I could and just play with confidence as I had nothing to lose. We work hard on getting wingbacks on the end of crosses and luckily I managed to do that and score.”
The local lad continued: “And we really felt we could go on and win the game. We rushed back to get started again and we dominated the final 10 minutes.
“I thought I was going to get on the end of another cross to score again, but a defender got in the way. Luckily the ball fell to Siriki who has the bit of magic required to score from that position.
Peterborough will look to carry their positive momentum into the midweek action, when they take on Cardiff City at home tomorrow evening.
We’ve gathered the best of today’s transfer speculation below…
5. Luton target coy on speculatuon
Luton Town transfer target Tayo Edun has batted away suggestions he could leave Lincoln Town in the current transfer window, insisting he only wants to discuss on-the-field matters. He provided an assist for his side in their 2-1 win over Fleetwood Town last weekend. (The 72) Photo: George Wood
6. Seasiders plot Laird swoop
Blackpool could be set to hijack Swansea City's loan move for Man Utd youngster Ethan Laird. The versatile defender impressed on loan under Swans boss Russell Martin when they were at MK Dons together last season, but could be yet be swayed into joining the Seasiders. (The Sun) Photo: George Wood
7. Lowe set to join Swans
Sheffield United defender Max Lowe could be set to move to Swansea City on loan. The £3.5m man, who was capped extensively for England at youth level, is not believed to be in his manager's plans for the current season. (The Sun) Photo: JON SUPER
8. Cottagers link with Portuguese midfielder
Fulham could be set to chase Sporting CP midfielder Bruno Paz, according to reports in Portugal. The 23-year-old could be allowed to leave on a free transfer, with a buy-back clause inserted in the deal to ensure they can re-sign the player cheaply if needs be. (Record) Photo: Steve Bardens