Rhys Oates struck against the run of play in the first half before Jack Perkins did likewise after the restart and then Tom Eaves won it from the penalty spot. Here are our player ratings from Sixfields...
1. Ross Fitzsimons
Oates lashed beyond him to break the deadlock but Mansfield did not test him enough when they were on top either side of half-time. Perfectly placed to gather Akins' late header... 7 Photo: Pete Norton
2. Conor McCarthy
Back in the side after three weeks out and improved after an edgy start. Very well positioned to block from Roberts shortly after Mansfield hit the front. Sent in the cross that McGeehan flicked on for Perkins to thunder home. Withdrawn with 20 to play... 7 Photo: Pete Norton
3. Jordan Willis
His third start in four games and was perhaps the pick of the back three. The physicality and movement of Oates and Evans troubled Town's back three but he positioned himself well and didn't allow many clear openings. Got stronger as the game went on... 7.5 Photo: Pete Norton
4. Jordan Thorniley
His header in the first 60 seconds couldn't have missed by much after rising well to meet Taylor's corner. Came under pressure and had one or two uncomfortable moments as Cobblers wobbled after Oates' goal but stood firm and produced a big block in the second half... 7 Photo: Pete Norton