Things looked good for the Terriers when they took a two goal first half lead through Jordan Rhodes and full debutant Graham Carey at London Road this afternoon, but a goal just in first half added time gave Peterborough the platform to storm back and win the game by two clear goals.
Town lined up in their usual 4-4-2 formation, with debutants Graham Carey at left back and Damien Johnson in central midfield. With Gary Roberts out of the side, Scott Arfield moved out to the left wing.
Arfield was in the action in his new position after just 70 seconds, crossing to the near post where Jordan Rhodes volleyed way over the bar at full stretch.
At the other end Lee Peltier did excellently to get his body in front of the dangerous Craig Mackail-Smith as the striker looked to latch onto George Boyd's through-ball moments later, shepherding the ball over the dead ball line for a goal kick under severe pressure.
Midfielder Arfield was well positioned inside his own area to head away a dangerous McCann free-kick in the 8th minute as the game continued to quickly move from end to end, but from the resulting corner defender Seth Nana Ofori-Twumasi lost his marker at the near post before heading the ball into the floor, with the bounce taking it over the crossbar.
Another well delivered free kick from McCann - this time from the Town right after McCombe held down Mackail-Smith - evaded everyone in the six yard box before dropping to centre-back Langmead beyond the far post, but he scuffed his kick badly wide in good space.
Town were back on the attack in the 11th minute when Rhodes battled to reach McCombe's long pass and forced the defender to play the ball straight to Pilkington; he turned the ball over the top for the onrushing Gudjonsson, but the Icelander volleyed high and wide from a narrow angle.
The Terriers went incredibly close in the next minute through Anthony Pilkington. After collecting a pass on the right from Joe Garner, the winger cut inside onto his left foot and let fly with a 25 yard piledriver that rattled off the crossbar before hitting the goalkeeper's back and dropping inches wide of the post for a corner.
Lee Clark's side were on top at this stage and after Boyd clattered into Gudjonsson wide on the right, full debutant Graham Carey tried to sneak a wide free-kick in at the near post. However, the ball always drifted wide.
Peterborough were back on the attack moments later when Mackail-Smith got the better of Peter Clarke down the left channel and knocked an intelligent cross to the penalty spot, but midfielder Davies' diving header was turned around the post by Alex Smithies.
Graham Carey's 22nd minute free-kick looked on target until it hit a man in the wall and drifted wide for a corner, but from that set-piece Town took the lead.
GOAL - Jordan Rhodes netted his third goal of the season in the 22nd minute from the resulting corner. Carey travelled across to the right flank to deliver the ball to the near post and when it wasn't cut out, the striker ran onto the ball and powered a header to the goalkeeper's left side to give his team a welcome lead.
Town continued to attack following the opening goal and when Garner was fouled by midfielder Davies a good thirty yards from goal, Carey stepped up and powered a decent effort over from the free-kick.
The travelling faithful were in good voice and were cheering their men on loudly - they particularly loved Joe Garner's challenge on Seth Nana Ofori-Twumasi by the touchline!
BOOKING - Graham Carey was shown the first yellow card of the game in the 28th minute for a late challenge on Aaron Davies, which was the second indiscretion by the young Irishman.
Peterborough then had the ball in the net from the resulting free-kick, but Ryan Bennett's header was immediately ruled out for offside.
Home right-back Little did very well two minutes later as Gudjonsson played a quick free-kick towards the near post for Joe Garner to head home, diving full length to head the ball behind. The Posh broke on the Terriers from the resulting set-piece, but Scott Arfield tracked his man all the way back to the edge of the box and pulled off a great sliding block as he tried to shoot.
Gudjonsson pulled off a similarly impressive tackle on Boyd inside the area from the resulting corner and was at the other end of the pitch moments later, winning a free-kick when a defender barged into him.
GOAL - From that free-kick Graham Carey netted his first goal in Town colours with a spectacular 25-yard strike. The Irishman had already taken a couple of efforts that looked good in the first-half and this time he made no mistake - stepping up and bending a fabulous effort past the goalkeeper and into the goal off the right-hand post.
The home crowd were frustrated by the referee at this stage, who was awarding Town free-kicks all over the pitch for some pretty vociferous challenges. One late challenge on Jordan Rhodes drew derision from the home supporters, but Mr. Williamson immediately stopped play so that the goalscorer could receive treatment.
Defender Bennett was overstretching to try and latch onto another McCann free-kick in the 39th minute and could only direct his header well wide under pressure from Jamie McCombe.
Striker Mclean did very well to hold up McCann's chip towards the area under heavy pressure from Peltier before laying it off to Boyd, but his powerful shot was deflected wide by a Town defender.
Peterborough were putting Clark's side under some pressure at this stage, but the ever-reliable Peter Clarke did excellently to block McCann's useful-looking 20 yard drive in typical fashion as the half drew to a close.
GOAL - Peterborough scored a lifeline goal in the first minute of first half added time when a rare Alex Smithies error gifted George Boyd a goal. The mercurial winger picked up the ball inside the Town area from right-back Little's low pass and turned well before hitting a snapshot towards goal; Alex would deal with that type of effort 99 times out of 100, but somehow the ball squirmed through his hands and into the vacant net.
HALF TIME: PETERBOROUGH UNITED 1 HUDDERSFIELD TOWN 2
SUB - Peterborough made one change during the interval, replacing Seth Nana Ofori-Twumasi with Tommy Rowe.
The Posh created an early chance when Davies sent a floating cross towards the far post from the right flank; after Peltier and Mclean tangled, Boyd fired a volley over the bar from an acute angle.
Carey was walking on thin ice at this stage, with one trip on Little drawing calls for a red card from the home supporters just four minutes into the half. However, the referee brought the defender across for one last warning instead.
GOAL - Peterborough equalised from the resulting free-kick, with striker Aaron Mclean netting from close range. Midfielder McCann was the man to deliver the set-piece from the right flank, with the powerful striker holding off a defender before connecting with a low volley that gave Smithies no chance.
GOAL - Unbelievably the Posh then took the lead in just the 53rd minute through Craig Mackail-Smith. The pacey striker latched onto a clever ball around the corner from strike partner Mclean to advance on Alex Smithies; the defender made it back to make a last ditch challenge, but the ball ricocheted off the chest of the goalkeeper before hitting the prone striker and rolling agonisingly into the vacant goal.
The Posh were well on top at this point, with Davies's shot having to be blocked by Peter Clarke inside the area in the 56th minute.
BOOKING - Jamie McCombe was booked in the 57th minute after he wiped out Boyd in the centre of the pitch.
Home substitute Rowe did very well to block a snapshot from Rhodes in his own penalty area as the hour mark passed, but the ball was back up at the other end soon afterwards when Wesolowski hammered a drive over the bar.
SUB - Graham Carey was replaced with Gary Roberts in the 61st minute, with Arfield dropping in at left-back.
BOOKING - Damien Johnson was the third Town player to be shown a yellow card on the afternoon when his 63rd minute challenge brought down Mark Little.
SUB - Lee Clark made his second substitution in the 65th minute, with Lee Novak replacing Rhodes in attack.
Novak was immediately in the action, sprinting into the area and volleying a McCombe flick from a Peltier throw-in wide of the near post.
GOAL - Peterborough extended their lead to two goals in the 67th minute through a very simple goal for Aaron Mclean. The ball travelled the entire length of the pitch from the left back area when goalkeeper Lewis sent a long free-kick into the heart of the Town area and when the ball dropped over the head of Clarke, the speedy striker advanced and smashed the ball low into the far corner.
SUB - Lee Clark made his final throw of the dice soon afterwards, with Lee Croft making his debut at the expense of Pilkington in the 69th minute.
BOOKING - The referee booked Peterborough's Mark Little in the 71st minute for a late challenge on Arfield in the corner.
BOOKING - James Wesolowski followed him into the notebook moments later for a late tackle on Damien Johnson.
Croft went on an enterprising run down the right with fifteen minutes left, latching onto a clever through ball from Peltier before sprinting the full length of the Peterborough half and pulling the ball back for Garner; however, the loanee striker sent a powerful shot rocketing into the stand with big centre half Langmead in close attendance.
Gudjonsson sent a very hopeful effort high and wide of goal from long range in the 77th minute as Town continued to look for a lifeline and they created a great chance a minute later when Garner cleverly back-heeled Gudjonsson's low pass into the path of Scott Arfield; unfortunately, the Scotsman placed his side-footed effort wide of the far post.
Town continued to press, with Novak's deft overhead kick from Gudjonsson's corner being cleverly headed over the crossbar by Langmead. Novak was in action again moments later, heading over from the resulting corner at the far post.
SUB - Peterborough replaced goalscorer Mclean with former Shrewsbury man Tony Hibbert in the 82nd minute.
SUB - The third Peterborough soon followed, with Wesolowski replaced by Charlie Lee.
Town worked hard in the closing stages, but could not find the breakthrough they needed and came away from London Road empty handed. In fact, skipper Clarke and Smithies both had to be on hand before the final whistle to keep the Posh down to four goals. Lee Novak had a chance after Roberts put him in on goal at an angle, but 'keeper Lewis was quickly off his line to smother the ball as the striker tried to shoot.
The best effort came through substitute Gary Roberts' late dribble - he went past three players en route to goal and was unlucky to see his toe-prod cannon back off the post.
FULL TIME: PETERBOROUGH UNITED 4 HUDDERSFIELD TOWN 2
Town's Team (4-4-2):
Alex Smithies; Graham Carey (Gary Roberts 61), Peter Clarke (c), Jamie McCombe, Lee Peltier; Scott Arfield, Joey Gudjonsson, Damien Johnson, Anthony Pilkington (Lee Croft 69); Joe Garner, Jordan Rhodes (Lee Novak 65)
Unused Subs: Ian Bennett, Antony Kay, Theo Robinson, Liam Ridehalgh
Town Bookings: Graham Carey (28), Jamie McCombe (57), Damien Johnson (63)
Peterborough Bookings: Mark Little (71), James Wesolowski (72)