Leeds United left it late to preserve their unbeaten record and stay in pole position at the top of the Sky Bet Championship.
Jack Harrison cancelled out Jed Wallace's opener for Millwall in the 89th minute as they claimed a point against their old foes at the Den.
With Middlesbrough slipping up for the first time this season, away at Norwich City, both Brentford and Bristol City took advantage to climb above Boro on goal difference and within a point of Leeds.
The Bees defeated 10-man Wigan Athletic courtesy of a goal in each half from Neal Maupay – taking him to seven for the season already. Sam Morsy's dismissal for the midtable Latics was sandwiched in between the former France U21 international's strikes, just before the hour mark.
Bristol City enjoyed their fourth league success in a row, beating Sheffield United – who came into the game on their own four-win streak – thanks to Marley Watkins winner nine minutes from time.
At the bottom end, Reading lifted themselves above their hosts, Preston North End, to move a place further away from winless Ipswich Town at the foot of the table with their first victory of the season.
Leandro Bacuna scored the decisive goal nine minutes from the end after the Lilywhites had twice come from behind to level.
All eyes were on the division’s early pacesetters as leaders Peterborough United hosted Portsmouth. As two of five teams in Sky Bet League One without a loss to their name, both sides went into the game with unbeaten records to protect and it was Kenny Jackett's side who emerged victorious in the top of the table clash.
Second half goals from Oli Hawkins and Jamal Lowe lifted them above their hosts to the summit of the table, Matt Godden's injury-time consolation coming too late to allow for a grandstand finale at the Abax Stadium.
Barnsley, Sunderland and Walsall started the day occupying the places beneath the top two and were the other sides to boast an unblemished record from their opening seven games; however, all three suffered defeat on Saturday.
The Tykes and the Black Cats were both beaten by the odd goal on the road, while Doncaster handed out a 4-1 defeat to Walsall at Banks's Stadium to climb above them and into the play-off places – joining the other three on 15 points.
At the other end of the table, Shrewsbury Town recorded their first win of the campaign thanks to goals from Greg Docherty and Lee Angol at opposite ends of the first half. The Shrews 2-0 win over Southend United left bottom side Plymouth Argyle as the only team without a three-point haul to their name in League One.
Yeovil Town supporters had the most reason to smile on Saturday evening across the whole of the EFL after the Glovers ran rampant at Rodney Parade.
Mike Flynn's Newport County had started the season impressively, riding on the coattails of Sky Bet League Two leaders Lincoln City, however, they were dismantled by an unforgiving Yeovil team.
Three goals in each half, from six different goalscorers, saw Darren Way's side run out comfortable 6-0 winners to climb to fifth. Robbie Willmott was later dismissed for the home side to compound their woes, but only after the damage had been done.
Exeter City jumped above the Exiles on goal difference into second spot with an excellent 2-1 win at Mansfield Town – inflicting the Stags first league defeat on them in the process.
Only Milton Keynes Dons and Forest Green Rovers have yet to lose in League Two after the pair shared the spoils at Stadium MK.
Danny Cowley's Imps continue to set the pace, winning for the sixth time this term at Moss Rose against last year's National League champions Macclesfield Town, who are still looking to find their feet in League Two.
The Silkmen's return of two points from a possible 24 so far sees them lie 23rd in the table, sitting only above Notts County on goal difference.
For most of Saturday afternoon supporters at Meadow Lane were anticipating climbing off the bottom of the table but three times Stevenage came from behind to deny them in a thrilling 3-3 draw. The point at least breaking up a run of eight consecutive defeats in all competitions and giving new boss Harry Kewell something to build from.