A fast start was expected by Dundalk in this fixture and they delivered, with only 5 minutes on the clock the league leaders were ahead.
Paddy McEleney intercepted a Finn Harps throw in on the left hand side of the pitch and drifted past two players heading into the centre of the pitch and unleashed an unstoppable effort that went into the bottom left hand corner of Gallaghers net.
On 12 minutes the lead was nearly doubled as John Mountney found space on the corner of the box and drove a shot low and hard towards the net only to be parried away by Gallagher.
Another effort for Dundalk soon after from the edge of the box from Horgan was comfortably saved by Gallagher but this game was only looking to finish one sided, with a victory for the liliywhites ominous.
There were thoughts that if things went there way that it could be a high scoring affair and a Fantastic ball through the middle from Shields for McMillan seen him with a chance but the keeper was out fast to gather up safely.
Just before the break Paddy Barrett hit a point blank header from 6 yards after a McEleney free kick but it came back off the bar to keep the game at one nil going into the break.
On a bad note, Harps striker Ruairi Keating went down with nobody around him on 49 minutes. There was a bit of concern which brought on all the medical staff to the player. He was substituted for Dave Scully straight away for pre-caution.
It took Finn Harps 62 minutes to have their first attempt Dundalk’s goal but a soft header was easily gathered by Gary Rogers
A talking point that could have been was a possible penalty waved away by the ref after Robbie Benson seemed to be taken to the ground for in the box after a strong challenge.
Finn Harps manager Ollie Horgan was then sent off to the stands by Neil Doyle for disputing Ciaran Gallagher’s booking for time wasting.
The game was ended as a contest when on 75 minutes some nice work from Ronan Finn ended with him flicking a ball through a defender to be met by Daryl Horgan who smashed past the helpless Gallagher at the near post for his eight league goal of the season.
The win puts Stephen Kenny’s men 10 points clear in the league and sets them up perfectly for their Europa League trip to face AZ Alkmaar on Thursday.
Dundalk: Rogers, Gannon, Boyle, Shields, Horgan, Mountney, McMillan, McEleney, Massey, Barrett, Benson.
Subs: Gartland, O’Donnell, Grimes, Kilduff, Shiels, Finn, Sava.
Finn Harps: Gallagher; Coll, P Mailey, Cowan, McMonagle; McNamee, Funston, Harkin, Curran, J Mailey; Keating.
Subs: Coyle, McHugh, Banda, Scully, Brush.