Airdrie substitute Kevin Watt fired two goals in the last 10 minutes to secure victory against Peterhead.
The visitors frustrated Airdrie for long spells with a dogged defensive display before Steven Instead was shown a red card for a two-footed lunge.
Watt showed great awareness in the 80th minute when he picked up a loose ball inside the penalty area and skip the ball into the net past Michael Kula.
He added a late second when he chased a through ball and swept the ball home.
Airdrie Utd: Robertson, McKenna, Lovering (Waddle 69), McDonald, Smyth, Donnelly, Smith (Watt 77), Andreoni, Russell, Prunty (Noble 65), McDougall. Subs Not Used: Brady, Hollis.
Goals: Watt 80, 87.
Peterhead: Kula, Buchan, Mackay, Mann, MacDonald, Cowie, Sharp (McKay 71), Soane, Bavidge (Istead 58), Donnie Munro, McAllister (Bagshaw 88). Subs Not Used: Anderson, Bruce.
Sent Off: Istead (66).
Booked: MacDonald, Donnie Munro.
Ref: A Law