|O'Brien 4||Venue: Oakwell
MILLWALL suffered a dismal defeat at fellow strugglers Barnsley to leave them teetering just a point above the relegation zone.
Jim O'Brien's early goal proved to be the difference between the two sides and Charlton's win over QPR slashed the Lions' cushion above the bottom three.
Ian Holloway's side rarely looked like getting back into the game as the Tykes resolutely defended their one-goal advantage.
Shane Lowry, DJ Campbell and Scott McDonald came into the side in place of Alan Dunne, Lee Martin and Jermaine Easter, who were dropped from the XI that started against Bolton.
Millwall had gone 1-0 down in their last two games and that trend continued as O'Brien punished some sloppy defending to convert a simple long ball after just four minutes.
The Lions were slow to respond and McDonald's blocked shot after pinball inside the area was the best chance they created in the opening 20 minutes.
Campbell had a rare sight of goal when Ed Upson's lofted pass was poorly dealt with by goalkeeper Luke Steele, but the striker could not steer home the loose ball.
Upson then fired over from distance before Steve Morison's glancing header was palmed around the post by Steele as Millwall finally began to find their rhythm.
And McDonald must have thought he had equalised when he flicked Ryan Fredericks' cross towards the far corner, only for Steele to claw the ball away.
The Lions passed and kept the ball well in the first half but nerves got the better of them after the break as they put in a disjointed display.
Morison had an early effort on goal with an ambitious half-volley that sailed over before Danny Shittu made a vital block to deny substitute Stephen Dawson.
It was not until the final 15 minutes that Millwall finally created meaningful openings.
Steele made a double save to first palm away Shaun Williams' ferocious drive and then parry Campbell's snapshot from close range.
But the visitors had David Forde to thank for keeping the score at 1-0 when he thwarted Dale Jennings and Chris O'Grady in quick succession.
Williams then curled a 25-yard free kick inches wide of Steele's near post but the Lions' brief rally proved too little too late.