Jim Gannon made three changes for the eagerly-awaited derby.
Johnny Mullins and Stephen Gleeson dropped to the bench whilst Gareth Owen was left out of the squad completely. James Tunnicliffe, Michael Rose and Tommy Rowe were their replacements.
New goalkeeper Fraser Forster, who arrived on loan from Newcastle on Thursday, was given squad number 21 and a place on the bench.
Oldham kicked off attacking the Railway End and put the County defence under immediate pressure.
In-form Chris Taylor might have scored twice in the first three minutes. Both efforts were from the edge of the box. The first was just wide of Owain Fon Williams right-hand post; the second brought a decent save from the Welsh 'keeper.
The dangerous Taylor then turned provider with a deep cross from the left which picked out Chris O'Grady. The striker tried to head the ball back across Fon Williams but he missed the target.
Twenty minutes in the Blue & White Army at last had something to cheer. Paul Turnbull played his 'Wembley' ball out to Leon McSweeney. The defender hit a cross with the outside of his foot which was just too high for Peter Thompson lurking at the far post.
Latics hit back and James Tunnicliffe did well to block O'Grady's shot at the expense of a corner.
Oldham packed the six-yard box around Fon Williams and, when Andy Liddell's corner came in, the keeper seemed to touch the ball into his own net. Liddell, though, looked to claim the goal as well.
The goal sparked some unsavoury scenes in the Cheadle End. Some visiting fans had purchased tickets for the home end and fighting broke out and the referee stopped the game for a couple of minutes as supporters spilled onto the pitch.
With the Oldham fans removed the game continued and the visitors continued to dominate.
Ten minutes before the break Michael Raynes lost possession and Jimmy McNulty came to his rescue with a timely block to deny Mark Allott.
Craig Davies, who scored a hat-trick when Latics beat County in the Manchester Senior Cup last week, then came close with a low drive.
Three minutes before the break the Hatters won possession from an Oldham corner and Pilkington broke down the right. His pass played in Thompson but the striker's first touch was far too heavy and the ball raced through to mark Crossley.
County had another chance in first-half stoppage time when Thompson crossed to Pilkington. Crossley tipped his header over the bar but the referee awarded a goal kick.
Carl Baker was introduced during the break with Michael Rose making way.
The change produced almost immediate d dividends when County levelled two minutes in. Rowe crossed from the left; Thompson flicked it on to Paul Turnbull who volleyed past Crossley for his first Hatters goal.
County were now passing and moving with purpose after being second best for most of the first half.
But they had a let off when O'Grady mis-timed a header after 57 minutes.
Five minutes later O'Grady fired over when well placed at the edge of the box.
Unbeaten Latics had another chance soon after when Danny Whittaker cleverly created space in the box. He tried to chip Fon Williams but cleared the bar.
County responded with a powerful drive from McSweeney. Crossley spilled the shot but Thompson couldn't apply the finishing touch.
Two minutes later, though, County's Number Nine made it two-in-two with a clinical finish Tunnicliffe's long throw was flicked on by Raynes to the Irishman who volleyed past Crossley.
Edgeley Park erupted with the Cheadle End giving a vociferous rendition of the new Peter Thompson song.
Stephen Gleeson then go in on the act when another flowing County move ended with the Irishman producing an acrobatic overhead kick that was well saved by Crossley.
The Blue & White Army were now cheering every pass and the noise moved off the Richtoscale with a third goal. Raynes got clear of the Latics defence and the new skipper expertly lobbed Crossley and send Edgeley Park into raptures.
It had been a fantastic second-half performance by the Hatters who inflicted the first defeat of the season on their near-neighbours and moved into the top seven in the process.



