The solitary goal from Truro City was enough to overcome the ten-men of Witham Town in the FA Trophy 2nd qualifying round.
Town's goalkeeper Martyn Guest was sent off early in the second half when he brought down Ryan Brett in the box but the resulting penalty was missed.
Craig Duff prevented the game reaching extra time after latching onto an Isaac Vassell through ball.
The visitors dominated much of the first half but Guest kept Witham in with a shout after saving from Ryan Brett and Duff.
Town had attempts of their own to take the initiative in the game but Ellis Brown and Connor Mead shot wide from good positions.
Just four minutes into the second half the home side was reduced to ten men when Guest hauled down Brett, meaning Brad King was put in goal, but Duff sent the resulting spot kick over the bar.
Witham were trying to balance defence with attack to but were unable to establish any real pressure against an in-form Truro side.
The breakthrough came on the 78th minute when stand-in goalkeeper Brad King palmed a save into the path of Duff to score the winning goal.