Neighbours Dagenham and Leyton Orient will meet again in an FA Cup replay after a full-blooded London derby ended in a draw.
The game swung from end to end like a pendulum in the frenetic opening exchanges with Jonathan Tehoue nodding wide from a corner and Danny Green tormenting his marker at the other end.
The powerful Frenchman was instrumental in Orient taking the lead after 45 minutes when he was challenged by Romain Vincelot in the area and the ball fortuitously looped into the path of the on-rushing Alex Revell, who slotted past Chris Lewington in front of the large travelling support.
As Daggers boss John Still prepared a motivational half-time team talk, his side unexpectedly levelled in the second minute of injury time.
Green's free-kick, from towards the left-hand touchline, swung invitingly towards the near post and eluded everyone while keeper Lee Butcher could not claw it out from behind his line.
Chances were at a premium in the second half, but Daggers had Lewington to thank for earning a replay after his point-blank save denied Dean Cox seven minutes from time.