David Hughes scored twice for Eastleigh as they leapfrogged over their Hampshire rivals into fourth place at a wet and windy Ten Acres on Tuesday night.
It was Bashley's first defeat under the management of John Robson and the home side achieved their success despite playing with ten men for the entire second half after midfielder Phil Warner had been red-carded.
It was the third meeting of the season between the sides, each having beaten the other 4-1 at home. But Eastleigh were probably happier with this result than their earlier Hampshire Senior Cup success.
Both sides went close before Eastleigh went ahead after 21 minutes. A flowing move ended with a lay-off from Robbie Matthews and Hughes drilled the ball home from a narrow angle.
They increased their advantage just five minutes later when Lee Bright's pass put Nicky Banger clear and the prolific striker tucked the ball past keeper Mike Hookway.
Several players were booked as the tempo quickened and the visitors pulled back a goal just before the interval. Aaron Cook's shot was well parried by Colin Matthews, only for Mat Jones to fire the rebound goalwards, where it was blocked by the hand of Rob Marshall.
The referee surprisingly took no action against the Eastleigh skipper but showed Phil Warner the red card for foul and abusive language in disputing the penalty award. After a long delay, Craig Davis beat Matthews from the spot. With Bash having the better of the opening exchanges in the second half against ten men, things looked grim for Eastleigh.
But the visitors pressed the self-destruct button after 53 minutes when Ollie Cherrett's throw-in back to his keeper put Hookway under pressure. His hurried clearance went straight to Hughes and from fully 35 yards, the former Saints midfielder fired home a fine shot.
It effectively ended the game as a contest and although Bashley kept plugging away, it was the ten men who looked more likely to add a fourth goal.
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