The win helped cut the gap to the play-offs down to seven points and keep the dream alive.
Our match photographer David Lowndes was on hand to capture just some of the faces in the crowd.
Check out this gallery and see who you know.
You can get all the week’s Posh news, here.
1. Posh v Plymouth
Posh fans pics enjoy the 5-2 win over Plymouth. Photo: David Lowndes
2. Posh v Plymouth
Peterborough United fans enjoy the 5-2 win over Plymouth Argyle. Photo: David Lowndes
3. Posh v Plymouth
Peterborough United fans enjoy the 5-2 win over Plymouth Argyle. Photo: David Lowndes
4. Posh v Plymouth
Peterborough United fans enjoy the 5-2 win over Plymouth Argyle. Photo: David Lowndes