Millwall reached the FA Cup quarter-finals witha 3-0 victory against Luton at Kenilworth Road.
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The Hatters had stunned the Norwich to make the fifth round three weeks ago, and at times they looked more than capable of pulling off another big upset against a side ranked 67 places above them in the league ladder.
Andre Gray and Luton's match-winner from the previous round Scott Rendell combined well up front, but they could not find a way past David Forde and claim a victory that would have made them the first non-league side to make the quarter-finals in 99 years.
Rob Hulse, on loan from QPR, took his first goal for the club well, hooking the ball over Mark Tyler from a tight angle after James Henry had put the Lions ahead following a mistake by Jonas Kovacs.
Dany N'Guessan sealed the win with five minutes left.
The win means Kenny Jackett's side go into the hat for the quarter-finals for the first time since their club-record run to Wembley nine years ago.
Buoyed by their raucous support, Luton started the match strongly.
Gray played a clever one-two to open up some space in the Millwall box, but David Forde saved well from the lively striker.
The Lions raced straight up the other end and Hulse got in behind the Luton defence but he was unable to beat Mark Tyler.
That proved to be Millwall's only chance of the opening 10 minutes as the underdogs continued to pile on the pressure.
Gray slipped past Nadjim Adbou to enter the Millwall box but he shot at the near post when it would have been better to pull the ball back to the hordes of Luton players who were waiting.
Gray, and the impressive JJ O'Donnell raised the hopes of the home fans, but the visitors then took the lead through Henry.
Robert Kovacs mis-judged the bounce of an aerial ball and the forward raced through and rounded Tyler before slotting home from an acute angle. More police were drafted into the away end to deal with the ecstatic Millwall fans, who taunted the home supporters.
Luton threw everything forward looking for an instant reply. Arnaud Mendy went close with two efforts, but the Hatters lacked Millwall's shooting ability.
Hulse tested Tyler with an acrobatic effort and the journeyman striker then made it 2-0 10 minutes before the break, hooking the ball over his shoulder from a tight angle after the ball had bounced around the home box.
The scorer goaded the home fans and they responded by throwing a missile in his direction.
Luton came out full of energy after the restart, but Millwall stifled their attacks with some stubborn defending.
It took a brilliant pass from Alex Lawless to breach the Hatters defence, but Forde raced off his line to clear the danger before Gray could get to the ball.
Kovacs cleared the bar with a free header soon after as Luton continued to pressure, but it was Millwall who looked the more likely side to score.
A deflected shot dribbled in to Andy Keogh's path with 25 minutes to go, but Tyler came out to deny the Republic of Ireland striker.
Dany N'Guessan covered 50 yards in quick time on a rapid Millwall counter before laying the ball off to Lawless, who found Hulse at the back post but he tried to square when the better option would have been to go for his second.
Paul Buckle threw on Jon Shaw to beef up the Luton attack, but the home side remained on the back foot. Keogh made space at the back post, but he headed wide from Henry's cross.
N'Guessan made sure of the win five minutes from time when Tyler spilled John Marquis' shot and he turned home from close range.