Northampton Town scored three times in the final eight minutes to overturn a 2-0 deficit and knock Northern Premier League Division One Northwich Victoria out of the FA Cup.
James Constable put the away side in front on the hour mark, converting Josh Payne's free kick, before Payne turned in Ben Strevens's cross with 15 minutes remaining. Stourbridge's Karl Hawley saw his late penalty saved by Ross Flitney in the Eastleigh goal.
Scott Boden headed the only goal of the game as Newport County overcame Barnet at Underhill, while 10-man Sheffield United also won by a goal to nil thanks to Matt Done's strike early in the second half. Che Adams saw red for the Blades for violent conduct with 25 minutes remaining.
A 92nd-minute equaliser from Chesterfield's Lee Novak ensured that both they and Walsall would be in the hat for the next round, while Leyton Orient and Scunthorpe will have to replay after they played out the only goalless tie of the round so far.
Results in full (half-time scores in brackets): Barnet 0-1 Newport County (0-0), Chesterfield 1-1 Walsall (0-1), Leyton Orient 0-0 Scunthorpe (0-0), Millwall 1-2 Wycombe Wanderers (0-0), Northampton Town 3-2 Northwich Victoria (0-1), Portsmouth 1-0 Accrington Stanley (0-0), Sheffield United 1-0 Oldham Athletic (0-0), Stourbridge 0-2 Eastleigh (0-0), Yeovil 1-0 Stevenage (0-0)