Donegal Celtic made it four away wins out of five in the Premiership with victory at Cliftonville.
Ryan Henderson put them into the lead in the first minute with a long-range dipping volley and Eamonn McAllister made it two with a fine shot.
DC's Darren Murray was sent-off for a head-butt on Ciaran Caldwell and early in the second half Ronan Scannell pulled a goal back for the Reds.
Rory Donnelly headed an equaliser but Henderson's second sealed the win.
Henderson pounced from just a couple of yards out after home keeper Ryan Brown had fumbled the ball.