Blackfield & Langley were slayed 1-0 by their former striker Ashkan Karimzadeh at Gang Warily.
The ex-Portsmouth trainee side-footed Brockenhurst to victory on the stroke of half-time following good work by Steve Jenkin and Dave Midgley.
"It was our only good move of the game but we still deserved to win because Blackfield weren't a threat," said Brock player-boss Graham Kemp. "It was a disappointing performance but at least we kept our first clean sheet in four games."
It was an unhappy night for the Watersiders who had defender Mike Collins dismissed in the second half for allegedly talking out of turn to the linesman.
They also conceded a controversial penalty for handball when Ben Hillman slipped to the ground and had the ball whacked against him by Dan Marks, but keeper Paul Bowers made a fine double save from Danny Neville's spot kick.
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