Kevin Lisbie scored a late winner to maintain Leyton Orient's 100% record and their best-ever start to a season with victory against Port Vale.
Vale took the lead through Louis Dodds' stooped header from Tom Pope's cross.
David Mooney smashed in a disputed equaliser for Orient before grabbing his second from close range.
Jennison Myrie-Williams converted Doug Loft's cross to level, later hitting the bar with a free-kick before Lisbie lashed home the winner from 10 yards.
VIEW FROM THE DRESSING ROOM
Leyton Orient manager Russell Slade told BBC London 94.9:
"They never gave up, and that was the beauty of it today. We went a goal down but got ourselves in front, against the run of play.
"For the support to stay behind us when we were one down, and then it was 2-2 to stay with us, everybody's got their rewards.
"You'd rather be in this position than losing six out of six every day of the week. There's no danger about that."
Port Vale manager Mickey Adams told BBC Stoke:
"We're bitterly disappointed with the result, but we can take an awful lot of positives out of the game.
"I didn't want to come here and sit back to try and nick a result.
"We had a positive approach and it looked as though we were going to get something.
"Having said that, some of the goals we've conceded were absolutely criminal."
Live text and stats
Saturday, 14 September 2013
Leyton Orient 45%
Port Vale 55%
Attempts on target
Leyton Orient 9
Port Vale 2
Attempts off target
Leyton Orient 6
Port Vale 7
Leyton Orient 5
Port Vale 3
Leyton Orient 14
Port Vale 10
Live text and data provided by The Press Association.