Rochdale and Bury each finished with 10 men after a bad-tempered derby.
Rochdale defender Nathan Stanton was the first player dismissed after a foul on Elliott Bennett midway through the first half.
Bury took advantage when Nicky Adams reacted first to Andy Bishop's flick and fired past Tommy Lee.
Ben Futcher was the sent-off after a second yellow card for an off-the-ball incident before Adam Le Fondre's last minute penalty earned Rochdale a draw.
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