Sammie Szmodics scored twice for Posh and whilst Sam Hoskins briefly raised hope with a penalty, Jonson Clarke-Harris converted his own spot-kick to seal the deal. Here are our player ratings from London Road...
5. Joseph Mills
Had a poor night in truth. Regularly exposed by balls over his head and played Szmodics onside when Posh restored their lead. Delivery at the other end of the pitch missed the mark too many times... 4
6. Shaun McWilliams
Had a strong first-half when he got in and around the home side and broke up play effectively. But things became ragged after half-time and it all started when he tackled his own team-mate and Posh broke away for the crucial second goal... 5.5
7. Bryn Morris
He was Town's best midfielder on the night. Looked after the ball well - no midfielder on either side had a higher pass accuracy - and he was central to the handful of good moves Cobblers put together. Tested Bursik with an early effort... 6.5
8. Ryan Watson
The ball just wouldn't sit kindly for him as he tried to take aim with a couple of half chances in either half. Limited to bits and pieces in the attacking third... 5