Aiden O'Brien and Jed Wallace (2) steered Millwall to a comfortable win over Northampton Town on Good Friday at The Den in Sky Bet League One.
O'Brien opened the scoring on 27 minutes, before Wallace's thunderbolt doubled the lead seven minutes before half-time.
The Wolves loanee scored from close range in first-half stoppage-time to complete the victory.
Millwall boss Neil Harris made one change from the team that drew 1-1 with Gillingham last Saturday, bringing Lee Gregory into the starting line-up at the expense of David Worrall. Meanwhile, Jordan Archer returned from injury to take his place on the substitutes' bench.
The first five minutes of the match saw The Lions assert early pressure on the visitors without testing Adam Smith in The Cobblers' goal. The stopper, however, nearly caused himself great embarrassment as he sliced a clearance, with his second attempt blocked by Gregory. Fortunately for Smith, the ball was to bounce in his favour.
On 10 minutes, Millwall came agonisingly close to taking the lead, but O'Brien's shot hit the inside of the post and bounced away from the onrushing and unmarked Steve Morison.
Five minutes later, The Lions perhaps should have had a penalty-kick after Gregory was brought down following a neat passing move between the striker, Morison and Joe Martin. However, referee Graham Salisbury waved away all appeals.
Wallace's inviting cross just evaded Morison as the 18-minute mark struck as the home side pushed for the opening goal, but to no avail.
Matt Taylor stung the palms of Tom King on 21 minutes, but the stopper dealt well with what was The Cobblers' first attempt on goal of the afternoon.
On 27 minutes, The Lions took the lead in emphatic fashion. Martin's ball into the penalty area set off a one-two of headers between O'Brien and the left-back, with the former thumping home from around 10-yards out to open the scoring.
In what was becoming a frenetic half of action, King was called into action once more on 33 minutes, saving well from Luke Williams' shot, knocking it behind for a corner-kick.
Two minutes later, the goalkeeper pulled off his best save yet, stretching to tip Shaun Hutchinson's goal-bound sliced clearance over the crossbar.
Seven minutes before half-time, The Lions doubled their lead in thunderous circumstances through Wallace. Yet another miscued clearance from Smith found O'Brien and after his effort was blocked, the winger unleashed an unstoppable shot from 25-yards which sailed into the top corner.
Millwall were not done for the first-half there, however, as Wallace doubled his tally for the afternoon in stoppage-time, blasting home a shot from close range after impressive work once more from O'Brien.
Gregory and Hutchinson had chances as the second-half got underway, but The Lions were just unable to extend their lead. On 67 minutes, the lethal combination of Wallace and O'Brien combined again, but the latter's looping effort was palmed over the crossbar by Smith.
Millwall had another penalty shout turned down with 10 minutes remaining, this time as Morison appeared to play the ball on to a Cobblers arm. Once again, however, Salisbury stood firm and denied any spot-kick opportunity.
King made another comfortable save as the minutes ticked away, with referee Salisbury calling time on a comfortable win for The Lions shortly after.
Millwall: King, Martin, Hutchinson, Williams, Thompson, Gregory (Worrall, 64'), Romeo, Wallace (Onyedinma, 73'), Webster, Morison (Butcher, 83'), O'Brien. Subs not used: Archer, Cummings, Cooper, Abdou.
Scorers: O'Brien (27'), Wallace (38', 45+3')
Northampton Town: Smith, Buchanan, Anderson, Diamond, Anderson (Revell, 61'), Richards, Phillips, Nyatanga, Smith (Boateng, 23'), Taylor, Williams (Moloney, 68'). Subs not used: Cornell, McCourt, McWilliams, McDonald.
Referee: Graham Salisbury