Adam Metcalfe from Portadown Youth stepped up and slotted home a decisive penalty kick as County Armagh turned the tables on Alset Colombia.
Metcalfe started the match as a substitute but made a major impact by completing a superb comeback from County Armagh.
First-half chances arrived for the Orchard County boys but Alset grabbed the first goal to hold control at half-time.
Nedas Maciulaitis had two efforts bounce off the post, with both Caolan Marron and Andrew Wilson frustrated by the crossbar.
A formation switch to 3-5-2 from 4-4-2 helped County Armagh claim the upper hand in the second half.
Pressure was rewarded with a superb overhead kick by Connor Murtagh to level the match before Metcalfe made his mark from the spot.
“We watched Alset on the first day and, as expected, found a side good on the ball with plenty of skill,” said Brendan Grimes, the County Armagh Premier manager. “We should have been 4-0 up in the first half but went into the interval 1-0 down.
“The formation change helped us out and it is great to get that first win of the week.
“We lost on Monday but put in a great shift and continued that work-rate on against Alset to get the result.”
Portadown Youth had Brendan Litter, Mark Johnston, Scott Megaw, Patrick McPartland, Maciulaitis and Metcalfe on show.
COUNTY ARMAGH PREMIER: Matthew Leyburn, Brendan Litter, Shea Geraghty, Eoin Toal, Connor Murtagh, Andrew Wilson, Patrick McPartland, Ryan Lewsley, Reese McInerney, Caolan Marron, Nedas Maciulaitis. Subs (used): Scott Megaw, Mark Johnston, Adam Metcalfe.