Derry City moved to within a point of League of Ireland leaders Bohemians after Sammy Morrow's goal earned the Candystripes a vital win in Sligo.
Morrow's 13th-minute goal was enough for Derry to claim the three points as the lacklustre leaders were defeated 3-1 at Inchicore by St Pat's.
Jason Noctor's tackle on Clive Delaney on 72 minutes led to a pushing match involving all 22 players.
Noctor was dismissed while Derry's Steven Gray was also sent off.
Gray had been involved in Derry's vital early goal.
The defender made a run down the left flank and his cross was stabbed home at the back post by Morrow.
With Cork City held to a 0-0 home draw by Shamrock Rovers, Derry moved into second place in the table - a point ahead of the Leesiders.
The victory completed a tremendous week for Derry after their 1-0 win over St Pat's on Tuesday.
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