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Dartford came from behind to book themselves a place in the National League South play-off final.
Two second half goals from Darren McQueen turned the game around for the Darts after being a goal down at the interval.
Dartford will travel to Weymouth in the final next Saturday. The Terras beat Dorking Wanderers in stoppage-time to book their place in the final.
On Saturday, Havant took a 14th minute lead through Jonah Ayunga after getting on the end of a Danny Kedwell flick and finding the net.
Sanchez Ming dragged an effort wide for the Darts on the half-hour mark and the visitors were given a boost just before the break when Josh Taylor was dismissed for the Hawks.
Kedwell was one of three players replaced by home boss Paul Doswell at the break but 11 minutes after the restart Steve King’s side were level.
McQueen was put in by Ky Marsh-Brown and after taking a touch he fired home past keeper Ross Worner.
The Darts took the lead from the penalty spot and it was McQueen who converted, to score his second of the match.
Worner denied Elliott Romain a third with 20 minutes left while at the other end Ayunga put a shot narrowly over the bar.
Dartford: Sesay, Ming (Hyde 46mins), Braham-Barrett, Briggs (Marsh-Brown 46mins), Bonner, Hill, Jebb, Husin (Noble 61mins), Romain (Sheringham 81mins), McQueen, Wynter. Subs: Edwards, Wandaio.