They paid the penalty for their wastefulness when they too were reduced to ten men 17 minutes from time, conceding a penalty and then the three points.
The Terras could have been in front as early as the first minute when Tom Bearwish headed straight at Will Henry.
The home keeper, returning from injury, then made a superb double block from Malachi Linton. Chippenham got going and Freddie Grant's shot went astray.
Henry then pushed away a Jake McCarthy free-kick, before in the final minute of the half Leone Gravata received a straight red ...