Hamer Bouazza picked the perfect time to score his first goal of 2012 to set Millwall on the way to a fine win at Peterborough United.
Bouazza's fifth minute header settled any possible nerves The Lions may have had as they faced the team immediately above them in the Championship table.
Further quality goals from Andy Keogh (70mins) and Harry Kane (90mins) wrapped up a victory that moves Kenny Jackett's men eight points clear of the relegation zone.
"We were excellent tonight, and 3-0 probably does it justice athough we could have had a fourth with Harry Kane hitting the post," enthused assistant boss Joe Gallen.
"It seems to be the way it's going away from home, but after the disappointment against Reading it was just the tonic we needed."
Millwall showed three changes from the side beaten by Reading on Saturday with injuries to Shane Lowry and Jimmy Abdou robbing manager Jackett of their services.
Darren Ward returned to partner Paul Robinson in the heart of defence, whilst Jack Smith returned to the fold from injury to slot into central midfield alongside Josh Wright.
Scott Barron was also in the starting line-up, taking the place of left-back Tony Craig, who dropped to the bench.
The travelling support didn't have long to wait before those sitting in the seats were out of them - and those on the terraces were jumping for joy.
Just a shade under five minutes had passed when James Henry's persistence paid off handsomely as he charged the ball down on the halfway line, played a neat one-two with Keogh before producing a delicious deep delivery met by Bouazza, whose textbook header bounced down and high over the head of Posh keeper Paul Jones.
Posh tried to force an instant response and there was a sigh of relief in the away camp when Paul Taylor lashed an angled drive wide from a good position just two minutes later.
Millwall had a penalty appeal turned down on 12 minutes when Keogh slipped a neat ball through to Kane, and the teenage striker went to ground under a heavy challenge.
In an even opening 45 minutes, both teams created half-chances; Matthew Briggs dragging a low drive considerably wide in the 18th-minute for Posh, whilst Kane's angled shot was fumbled for a corner by Jones at the other end.
Skipper Robinson, who marshalled the visiting defence superbly throughout, made a perfectly timed tackle to nick the ball off the feet of Tyrone Barnett on the rare occasion he had time and space in the danger zone.
Robbo's determination and precision not only in the tackle, but in possession, was matched by his team-mates as they built on a solid first-half performance with a dominant display after the break.
Kane was a whisker away from adding a second goal after 49 minutes when, having received a neat pass from Smith, he took a couple of steps forward before hitting a crisp curling effort from 18 yards that clipped the upright and bounced to safety.
Keogh, at the centre of some delightful attacking play by The Lions, slipped the ball through to Bouazza after 58 minutes, but the latter's inviting delivery flashed across the face of goal needing just the slightest of touches to convert.
Barron and Kane then combined on the left flank in a near identical move after 63 minutes, the latter's low cross inches away from the boot of the onrushing Henry.
However Millwall - and the irrepressible Keogh - were not to be denied and Jackett's men finally got the second goal they had been threatening in the 70th minute. Henry's pinpoint free-kick picked out Keogh, and the frontman's looping header left Jones grasping at thin air for his fourth goal in five games.
If that goal was good, Millwall's third was even better. Posh had threatened briefly - a fine defensive header by Robinson averting the danger from Mark Little's cross with nine minutes to go.
But in the 90th-minute the result was put beyond any doubt when David Forde's huge upfield punt picked out Kane, who steadied himself before thumping a low drive beyond Jones with a quality finish that reflected his team's display.
Peterborough United: Jones, Little, Briggs (Kearns, 66mins), Zakuani, Boyd, McCann, Sinclair (Frecklington, 54mins), Rowe, Barnett, Taylor, Alcock. Subs not used: Lewis, Ball, Brisley.
Booking: Barnett (72mins)
Millwall: Forde, Dunne, Barron, Smith, Robinson, Ward, Bouazza (Craig, 85mins), Wright, Keogh, Kane, Henry. Subs not used: Allsop, Feeney, N'Guessan, Mason.
Bookings: Barron (64mins), Dunne (67mins)
Scorers: Bouazza (5mins), Keogh (70mins), Kane (90mins)
Ref: G Eltringham
Att: 6,392 (away 652)