Marvin Morgan scored the only goal of the game to give Hartlepool United and their manager Ronnie Moore renewed hope of avoiding the drop.
He hailed an 'immense' win for his side afterwards while Chris Wilder lamented a poor goal to concede defensively as Lee Collins' back pass fell to Morgan to beat Matt Duke.
The Cobblers travel to Mansfield on Saturday aiming to regain their momentum and begin another good run of form.