Neil McCafferty was on target for Dungannon late in the game at Drumahoe
Neil McCafferty's 90th-minute penalty earned Dungannon an opening Carling Premiership win at Institute.
Injury-hit Stute looked to have held out for a point but Mark Scoltock was harshly adjudged to have fouled Calvin Mooney as the game entered added time.
Dungannon's Timmy Adamson tested Gavin Cullen early on while Stute's Declan Divin wasted a great chance.
Institute's Sean Friars and Dungannon's Michael Ward were sent off after a second-half melee.
Institute boss John Gregg was forced to release eight players during the summer because of cost-cutting measures.
To make matters worse, David Ogilby was ruled out by suspension while Paul Brown and James Quigley were among other Stute absentees.
Dungannon had an early chance but Gavin Cullen saved Timmy Adamson's header.
Divin had a great chance at the other end but he miskicked at the crucial moment after being set up by Ryan McCreadie.
The mediocre exchanges continued after the break although the temperatures was raised by the ugly 75th-minute melee which led to Friars and Ward receiving their marching orders.
A goalless draw seemed the inevitable outcome as the match petered out but then came the late drama.
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