Posh were trailing 1-0 when Edun was dismissed after just 27 minutes leading to a collapse from the home side.
Our man David Lowndes was on hand to capture these pictures of some of the fans who saw a painful defeat.
Get full reaction and the latest Posh news on our website.

9. Posh 0 Northampton 4
Peterborough United paid the price for a first half red card as they slummed to a heavy defeat to Northampton. Photo: David Lowndes

10. Posh 0 Northampton 4
Peterborough United paid the price for a first half red card as they slummed to a heavy defeat to Northampton. Photo: David Lowndes


12. Posh 0 Northampton 4
Peterborough United paid the price for a first half red card as they slummed to a heavy defeat to Northampton. Photo: David Lowndes
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