Dumbarton moved to within a point of Forfar with a deserved win over the Loons at Station Park.
Despite a storming start, Forfar were never at the races. Dumbarton, in truth, failed to fire on all cylinders either but did more than enough to secure all three points.
With only two minutes on the clock Forfar looked to have taken the lead only to be denied by the woodwork. Jay Stein sent over a great cross which was cleverly dummied by Paul Shields, and Paul Tosh hit a sweet right-foot volley past keeper Stephen Grindlay only for the ball to crash back off the post.
Forfar failed to follow up their bright start and the game slumped into a turgid affair.
Robert Dunn did go close for Dumbarton after 29 minutes when he flashed a shot across the base of goal. Then right on half-time Ian Dobbins looped a header just over the crossbar.
The deadlock was finally broken in the 58th minute when Robert Dunn fired Dumbarton ahead with a spectacular strike.
Forfar's Shields lost the ball in midfield and Dumbarton quickly found Dunn, who unleashed an unstoppable shot over the diving keeper and into the net.
Forfar could have equalised when Tosh forced Stephen Grindlay into a fantastic one-handed save, but Dumbarton still held the upper hand and Dunn doubled their lead in the 72nd minute.
A corner from the right was knocked to the back-post and Dunn reacted first to glance the ball over the line from close range.