Dumbarton came from behind to secure a narrow advantage over Arbroath in the first-leg of their play-off semi-final.
The visitors got off to a flying start when Stuart Malcolm rose highest to head home Josh Falkingham's cross in the sixth minute.
But they were pegged back 10 minutes later, Anthony Wallace applying a simple finish after goalkeeper Darren Hill failed to hold on to Scott Agnew's effort.
Alan Lithgow could have put the hosts ahead minutes before the interval but failed to direct his header on target from inside the six-yard box.
However, the Sons did claim the lead just after the hour-mark, Bryan Prunty with a neat finish inside the area after a well-worked free-kick with Agnew.
Liam Caddis and Lee Sibanda both went close in the final minutes but the home side held firm.
Dumbarton: Grindlay, Nugent, Lithgow, McNiff, Creaney, Gilhaney (Gray 84), Nicoll, Wallace, Agnew, Prunty (Walker 71), Dargo. Subs Not Used: Ewings, Kennedy,Thomson.
Booked: Prunty, Dargo, Nicoll. Goals: Wallace 16, Prunty 61.
Arbroath: Hill, Baxter, Malcolm, Innes, McAnespie, Sheerin (Gibson 48),Doris, Falkingham, Kerr, Birse (Caddis 67), Samuel (Sibanda 84). Subs Not Used: White, Busch.
Booked: Innes, McAnespie, Hill. Goal: Malcolm 6.
Ref: Craig Charleston