Posh looked set to fall to an undeserved defeat when conceding a 90th minute goal to a shot from the halfway line, but substitute Matt Garbett popped up to make it 2-2 in the 94th minute.
It was a reward for another hard-running display under new manager Robbie Savage.
RATINGS KEY: 10-Out of this World, 9-Outstanding, 8-Very Good, 7-Good, 6-Okay, 5-Poor, 4-Stinker.
1. ALEX BASS
The goalkeeper was beaten from way out again, but he made up for it instantly with a brave save to keep it at 1-2 - 6.5. Photo: DAVID LOWNDES
2. CARL JOHNSTON
Very aggressive and very positive from right-back. Should have scored in the first-half, but a strong defensive display against lively opponents - 7. Photo: Joe Dent
3. HARLEY MILLS
The left-back is a man transformed under Savage. He's become very aggressive, but he hasn't sacrificed any of his quality. Defended well here and supplied a couple of delicious crosses - 8. Photo: s
4. LUCCA MENDONCA
Its tough being a centre-back in this style of play, but the teenager looked good again - 7. Photo: Leila Coker