Substitute JP Rooney scored the clinching goal for 14-man Louth midway through the first period of extra-time as the Leinster county scraped past Antrim on a 2-13 to 0-14 scoreline in their SFC qualifier in Drogheda.
Antrim had lowered an early four-point deficit down to just one by the half hour. Louth's inside forward line of Aaron Hoey (0-2), Mark Stanfield (0-2) and Ollie McDonnell hit the ground running to open up a 0-5 to 0-1 lead.
Missing two 45s didn't help the Louth cause as PJ O'Hare's side gradually eroded that advantage. Points from Gearóid Adams, Kevin McGourty, Kevin Madden, who finished with 0-7, and Kevin Brady followed.
It was corner forward Brady who levelled on the stroke of half-time, but his side went in a goal down (1-5 to 0-5) as Stanfield swept home a sweet penalty, awarded for a foot block on McDonnell by Antrim net minder Sean McGreevy
Three Madden frees levelled things up ten minutes after the break and, following a second McGourty point, Louth substitute Alan Page received his marching orders, picking up his second yellow card with little over 15 minutes remaining.
Louth's first score of the half finally arrived from the boot of Hoey on 58 minutes and a fiery Rooney effort soon had the sides back on level terms.
In the closing stages of normal time, Antrim half-back Sean Kelly looked to have hit the winner from an awkward angle, however, it wasn't to be and the full-time scoreboard read 1-09 to 0-12 as extra time loomed.
The Saffrons were left cursing their luck as Rooney rounded McGreevy six minutes in to put Val Andrews' side 2-10 to 0-14 in front. Fittingly it was midfield stars David Devaney and Paddy Keenan who scored the final two points.