The match had been in some doubt because of continuous rain but referee Winter gave the go-ahead and the supporters were treated to a lively encounter.
Peter Weatherson came close to opening the scoring with a downward header from a Chris Millar free-kick but John Wight saved with his legs.
Weatherson made amends in the 23rd minute when he coolly converted a penalty after Craig Brittain tripped Jason Walker.
The Sons had rarely been seen as an attacking force but Craig Coyle had to be alert to dangerous crosses from Steven Bonar, one of which he spilled, causing a tremendous scrimmage near his goal.
Soon afterwards the goalkeeper was replaced because of contact lens problems.
David McGurn was in action immediately, blocking Eddie Annand's shot with his legs but John Dillon should have netted the rebound instead of firing over.
Nine minutes after the interval the Ton went two up.
Wight punched clear a corner to just beyond his penalty area where Stuart McCluskey pounced to drive home a splendidly accurate shot from 22 yards.
Chris Templeman, making his home debut, looked deceptively skilful for a tall man, but he was guilty of taking on too many opponents.
However, he made considerable amends in the 64th minute with a spectacular goal.
Jim McAlistair made ground on the left flank and supplied Templeman, who danced his way past three bemused defenders before slotting a low angled drive across Wight and into the far corner of the net.