Dumbarton moved into the fourth round of the Scottish Cup after a 3-2 win over Alloa Athletic this evening.
Sons moved into a three-goal lead during the first-half when goals from Mouhamed Niang, James Hilton and Michael Ruth put the hosts in a commanding position.
Luke Donnelly pulled one back for the visitors just before the interval as the Wasps looked for a way back.
Stefan Scougall added another for the away side to set up a tense finale but the hosts held out for a memorable victory.
The sides meet again, this time in league duty, on Tuesday in a re-arranged League One fixture.