McMillan hat-trick lights way for five-star Dundalk
Derry City 0 Dundalk 5
Dundalk showed why they are a class above the rest with this display at the Brandywell.
The visitors were more slick and ruthless as they easily saw off 10-men Derry City.
Goals from David McMillan (2) and Dane Massey gave them a commanding lead at the break.
Daryl Horgan got in on the act just before the hour mark, before McMillan completed his hat-trick in the closing stages.
Derry restored Conor McCormack, Harry Monaghan and Lukas Schubert to the starting line-up, replacing Sean Ward, Nathan Boyle and Joshuna Daniels.
League leaders Dundalk brought in Massey and McMillan, with Shane Grimes and Ciaran Kilduff dropping to the bench.
Dundalk took the lead with virtually attack as Horgan's corner found Brian Gartland, who out-jumped Ryan McBride and his header towards goal was deflected home by McMillan.
Derry were inches away from levelling things as Niclas Vemmelund's cross found Rory Patterson, but his glancing header was superbly tipped over by Dundalk keeper Gary Rogers.
The Lilywhites added a second on 21 minutes as City old boy Patrick McEleney saw his free-kick from 30 yards find Massey, who flicked the ball home past Ger Doherty.
Derry's miserable night got worse on 30 minutes when skipper Ryan McBride was shown a straight red card after he lunged into a challenge on Stephen O'Donnell.
Dundalk added a third on 40 minutes as Sean Gannon's through-ball released McMillan and the striker made no mistake, slotting the ball home past Doherty.
Just before the break the ten men went close to pulling one back when Barry McNamee's shot was tipped around the post by Rogers.
At half-time Republic of Ireland international and ex-Derry City man James McClean and Northern Ireland international Shane Ferguson got a standing ovation by the City supporters in recognition to their form at Euro 2016.
Dundalk added a fourth just before the hour mark when another super move ended with McMillan's shot parried away by Doherty, and Horgan was on hand to fire home the loose ball.
McMillan was inches away from completing his hat-trick on 75 minutes when his super header from 12 yards was outstandingly kept out by a fully stretched Doherty. He did get his third on 81 minutes when he got half a yard on the edge of the box, before blasting high into Doherty's top right hand corner.
Derry City - Doherty, Vemmelund, McBride, Barry, Jarvis (McClean 70); McCormack, McEneff; Schubert (McDermott 39), Monaghan (Boyle H-T), McNamee; Patterson.
Dundalk - Rogers, Gannon, Gartland (Barrett 79), Boyle, Massey (Grimes 66); Finn O'Donnell; Mountney, McEleney, Horgan (Meenan 69); McMillan.
Ref - PMcLaughlin (Donegal).