Orient skipper Stephen Dawson expects his side to "finish the job" in their FA Cup replay with rivals Dagenham & Redbridge next week.
Dawson's side took the lead through Alex Revell on the stroke of half-time at Victoria Road on Saturday, but there was time enough for Daggers to draw level before the break thanks to Danny Green's free-kick.
Dawson said: "Overall, there was only one team going to win the game on Saturday.
"I thought we played them off the pitch for 90 minutes. They never tried to win the game and we have to beat them on Tuesday week now and get into the second round.
"It would have been nice to have got through on Saturday, but it didn't happen, so we'll go back to our place now, hopefully get another good crowd and finish the job there."