Yan Klukowski's fine volley sealed all three points for Forest Green against Dartford in a bad-tempered game which saw two red cards produced.
Klukowski's wonderful shot arrowed into the top left corner to give Rovers the lead.
Harry Crawford was then sent off for the Darts after an off-the-ball incident with Aarran Racine.
Jamie Turley's red, for a foul on Lee Noble, evened up the numbers but Rovers held on for the win.
VIEW FROM THE DRESSING ROOM
Forest Green Rovers manager Dave Hockaday told BBC Gloucestershire:
"I'm very proud of them. We've kept a clean sheet and we've hung tough.
"We made it difficult for ourselves and won ugly but they didn't really trouble us.
"I can go on about all the things we should have done but it's three points and a clean sheet.
"I believe we are back in the play-off position and that's where we want to stay."