Isthmian Division One North Redbridge will be the lowest ranked team in the FA Cup second round after beating Oxford City in extra-time.
Seventh tier City took the lead when veteran striker Lee Steele controlled a high ball and drilled home.
Redbridge, who play in the league below the hosts, levelled when Nathan Gordon bundled home after Keith McLoughlin had saved Ben Bradbury's spot-kick.
And Bradbury scored the dramatic winner when he lashed home from close range.
Redbridge are away to Crawley on 3 December in their first ever FA Cup second round tie.
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Oxford City manager Mike Ford told BBC Radio Oxford:
"I thought we were fortunate to go into the break one up and all credit to Redbridge. They were better than us and deserved to go through.
"I thought tonight it was too big an occasion for the players. I have no idea why.
"Redbridge were tremendous. They went a goal down against the run of play and they've come back and nicked two and they deserve to win. Good luck to them, they've conducted themselves tremendously well, we are very disappointed but that's football and that's life.
"There are bigger disappointments in life then an FA Cup first-round replay defeat. We've just got to get on with it."