Barnsley bounced back from the disappointment of a home draw with bottom side Plymouth by thrashing second placed Peterborough at London Road - this 4-0 success their biggest ever at Posh.
This result ended a run of three defeats at London Road - each of their last two successes there has seen the Reds score four times.
The two sides have met at London Road on nine occasions this Millenium, Barnsley have now won six of those, losing four.
Barely a minute before George Moncur gave the Reds the lead, Peterborough were awarded a penalty, from which Adam Davies denied his former Reds team-mate Ivan Toney, the first penalty Davies has saved since April 2017 when he denied Brentford's Jota at Oakwell.
Barnsley had conceded goals from each of the last seven penalties awarded since then (all comps), six of them past Davies.
Barnsley are now unbeaten in their last 14 league matches when opening the scoring (W8 D6)
This was the fifth league game that Moncur has scored in but only the second Barnsley have won (also 3-0 v Sunderland)
This was the first time in five away games (all comps) that Barnsley have scored the first goal.
They have however opened the scoring in four of their six away league games this season.
This was their fourth away league win of the season, equalling their entire total for 2017-2018 in the Championship.
They have now won 10 of their last 14 away matches in League One.
Barnsley have now scored seven first half goals away from home in the league this season.
They have led at half time in four of their six away matches.
The Reds have been 2-0 up at half time away from home on two occasions now this season (also at Rochdale) and gone on to win both games 4-0. It is the first time they have led by two goals at half time in two away games in the same season since 2016-2017 (at Cardiff and Blackburn)
That was also the last campaign that Barnsley have scored four goals in three seperate matches (this season v Oxford, Rochdale and Peterborough, two seasons ago against Rotherham and at Wolves and Cardiff)
However it is the first time Barnsley have WON by four goals in three seperate matches in one season since the 1999-2000 season (6-0 v Portsmouth, 5-1 v Blackburn, 4-0 at Birmingham in the play-offs)
Brad Potts was back in the starting line-up for the first time since the 1st September, Barnsley had won only one of the subsequent four matches.
They are now unbeaten in the last seven league games in which Potts has started.
This was the third game Potts has scored in this season and all three have resulted in 4-0 wins, this was however his first brace since the 22nd October 2016 when he netted twice in a 4-2 win for Blackpool against Doncaster in League Two.
This was the first win that Kieffer Moore has not scored in since the first two games of the season, the striker had netted in three successive wins prior.
This was Peterborough's heaviest home league defeat since January 2017 when they lost 4-0 to MK Dons.
There has now been 43 goals scored in the last 13 Barnsley/Peterborough clashes (26 for Barnsley) and the Reds have scored four times on three occasions in that run.
Jacob Brown got his first career goal in the last away outing, he is the second Barnsley player to score in back to back away games this season along with Moore.
His effort is the fifth scored by a substitute this season (all comps)
Barnsley scored in both first half and second half stoppage time, it is the first time it has happened in a Barnsley match since the League Cup tie with Morecambe back in August 2017 (Morecambe's Sam Lavelle 45+1, Barnsley's Ryan Hedges 90+5) however it is the first time Barnsley have scored in both since January 2007 when Marc Richards and Brian Howard netted at the end of each half in a 2-0 win over QPR.
An injury to Kieffer Moore meant Barnsley were forced into a first half change for the second successive match - prior to this they had not made a first half sub since January 2017 when Marc Roberts came off 29 minutes into a 2-1 FA Cup defeat to Blackpool.
Barnsley made a record breaking start to the season of four successive clean sheets, this is the first since then (in 7)
Barnsley are the first side to stop Peterborough scoring in the league this season, the Posh remain the division's leading scorers (28) but Barnsley are now up to second in that list (24)
The Reds also have the best defensive record in the division (7) and only Middlesbrough (6) have conceded less in the entire Football League.
Of the six teams who started the day in the promotion chasing places (Portsmouth, Peterborough, Doncaster, Sunderland, Accrington and Barnsley) only the Reds and the Black Cats picked up points, with both winning.
Barnsley have lost only one of their opening 11 league matches. It is the first time they have lost only one of their opening 11 since the Fourth Division campaign of 1978-1979 when they lost only one of the opening 12. They finished that season fourth and were promoted.
George Moncur helped himself to one goal and two assists, meaning he now has four assists this season.
He is the fourth player to both score and assist in the same game this season after Moore, Dimitri Cavare and Victor Adeboyejo.
Barnsley enjoyed 55% ball possession, only at Bradford (49%) have they failed to have more ball possession than their opponents this season.
1. Adam Davies
12. Dimitri Cavare
5. Ethan Pinnock
6. Liam Lindsay
28. Ben Williams
27. Alex Mowatt
4. Kenny Dougall
20. Brad Potts
21. Mike Bahre
10. George Moncur
19. Kieffer Moore
33. Jacob Brown (for Moore 36)
7. Ryan Hedges (for Potts 78)
26. Mamadou Thiam (for Bahre 89)
13. Jack Walton
8. Cameron McGeehan
18. Adam Jackson
29. Victor Adeboyejo
1. Aaron Chapman, 2. Jason Naismith, 16. Rhys Bennett, 5. Ryan Tafazolli, 3. Colin Daniel, 21. Marcus Maddison, 6. Jamie Walker, 4. Alex Woodyard, 8. Mark O'Hara, 15. Joe Ward, 17. Ivan Toney.
9. Matt Godden (for Walker 27)
22. Darren Lyon (for Daniel 54)
11. Louis Reed (for Maddison 65)
10. Siriki Dembele, 14. Callum Cooke, 35. Jason Cummings, 40. Mark Tyler.
Peterborough manager Steve Evans said:
“Success is achieved over a long period and not every day will be a good day and this was a particularly bad day for us.
“It was collectively poor and individually poor. We were way off it and if that happens against a side as good as Barnsley you will be punished.
I have built a squad not just on good technique. I have built a squad that has great intensity, will press hard all over the pitch and will get in people’s faces. None of that happened today and we paid the price. “We had good players on the pitch. I believe we picked the right team. I wanted to play with a number 10 and Jamie is a natural there, but he didn’t look it today so I changed it.
“But no-one can be protected from that performance. Matty Godden came on early enough to miss two chances and he missed a good one at Sunderland in the last game so let’s not blame the selection. “We didn’t press them high enough up the pitch. We gave them too much space in which to play and they did it very effectively.
"I tipped Barnsley to be strong contenders for the title at the start of the season. They only lost one player from a Championship season and they’ve recruited well.
SkyBet League One results:
Saturday 6th October 2018:
(13th) Blackpool 2-2 Rochdale (15th)
(22nd) Bradford City 1-2 Sunderland (3rd)
(21st) Bristol Rovers 0-1 Walsall (5th)
(9th) Charlton Athletic 1-2 Coventry City (14th)
(6th) Doncaster Rovers 0-4 Fleetwood Town (10th)
(8th) Luton Town 3-2 Scunthorpe United (12th)
(2nd) Peterborough United 0-4 Barnsley (4th)
(23rd) Plymouth Argyle 1-0 AFC Wimbledon (20th)
(1st) Portsmouth 0-2 Gillingham (19th)
(16th) Shrewsbury Town 1-0 Accrington Stanley (7th)
(11th) Southend United 0-0 Oxford United (24th)
(17th) Wycombe Wanderers 2-1 Burton Albion (18th)
Barnsley lie in 4th place in Sky Bet League One with 22 points from 11 games.
We are 2 points inside the Play-Offs, 2 points off the Automatic Promotion Places, 5 points off First place and 12 points above the Relegation Zone.
Up to 07/10/18
Sky Bet League One Matchday Twelve: Barnsley v Luton Town, Saturday 13th October 2018. Kick-Off: 12noon
On The Road:
Sky Bet League One Matchday Thirteen: Charlton Athletic v Barnsley, Saturday 20th October 2018. Kick-Off: 3pm