DartforDians, who are second from bottom of London Two, caused the upset of the season when they travelled to the league leaders Portsmouth last weekend and came back from 17-0 down to win.
Trailing 12-0 at half-time and conceding a try immediately on the resumption, Darts regrouped and led by man-of-the-match Tim O'Donnell, gradually took control of the game.
It was the hefty No.8 who opened the visitors' account when he drove over from close range after switching from the blind-side to the open-side from the base of a scrum, and skipper Mark Hutchinson successfully added the conversion.
Having an outstanding game, fly-half Steve O'Brien then waltzed past four opponents to score, with Hutchinson adding another two points, and then he equalised the scores at 17-17 with a fine drop goal.
With the seconds ticking away Hutchinson attempted a penalty from the halfway line and although his effort fell short, the Pompey full-back decided to run the ball out of defence instead of kicking into touch to finish the game.
He was caught by a swarm of Darts forwards and having failed to release the ball, he conceded a penalty in front of his own posts from which Hutchinson successfully kicked with the last play of the match.
This Saturday Darts are away to bottom team Camberley.
Gravesend travelled to lowly Folkestone on Saturday and came away with a deserved 18-13 win, after putting in a disciplined display that was full of hard graft and team spirit.
Ian Sullivan, Austin Summers and Guy Stearns scored Gravesend's tries, and although they were all unconverted, Ben Day was successful with a first-half penalty.
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