Bryan Prunty scored four goals as Dumbarton trounced East Fife to claim a first league win of the season.
Martin McBride opened the scoring with a long-range effort before Prunty fired home his first on 20 minutes.
Prunty and James Lyden added further goals before the break and East Fife's Ryan Wallace missed a penalty after a foul by Lyden on Craig Johnstone.
A volley by Prunty on 79 minutes and a cool finish by the striker five minutes from the end completed the scoring.
East Fife: Michael Brown, Scott Durie, Campbell, Ovenstone, Muir, Johnstone, Park, Darren Smith (Young 3), Linn, Hislop (Ogleby 60), Wallace, Young (Robert Sloan 60). Subs Not Used: Collier, Cook.
Dumbarton: Ewings, Lyden, McNiff, Nugent, Creaney, Gilhaney, McBride (Brannan 75), Nicoll, Agnew (Ramage 86), Prunty, Walker (Winters 80). Subs Not Used: Grindlay, Wallace.
Goals: McBride 17, Prunty 20, 33, Lyden 45, Prunty 79, 85.
Ref: Steven McLean