|Deeney pen 10, Forestieri 29, Anya 48, McGugan pen 60||Venue: Vicarage Road
WATFORD increased the pressure on Millwall manager Steve Lomas with a convincing 4-0 win at Vicarage Road.
The Lions had Danny Shittu sent off after just ten minutes for a foul inside the area on Troy Deeney, who scored the subsequent penalty.
It was one-way traffic thereafter and Fernando Forestieri made it 2-0 before half time.
Ikechi Anya's fine solo strike extended the Hornets' lead and Lewis McGugan scored a fourth goal on the hour mark from the spot.
Lomas made five changes to his side following the 2-0 defeat to Middlesbrough with Justin Hoyte, Shane Lowry, Guy Moussi, Shittu and Jermaine Easter all starting.
The visitors were on the back foot from the first whistle and it took a last-ditch interception by Mark Beevers to prevent Sean Murray from getting on the end of Deeney's knock down.
But when Shittu felled Deeney from behind, referee Andy D'Urso had no choice but to give the defender his marching orders and the striker converted from the spot.
Lomas replaced Guy Moussi with Paul Robinson to ensure Millwall had four defenders on the field in a 4-4-1 formation.
Steve Morison saw his header cleared off the line by Ikechi Anya before the Hornets had an appeal for another penalty turned down when Deeney's shirt was tugged by Robinson.
However, Hornets fans did not have to wait much longer to see their side score a second.
In the 29th minute, Murray floated a simple ball over the top of Hoyte and into the feet of Anya, whose cross was stabbed in by Forestieri.
Full back Marco Cassetti could have made it 3-0 before the break but he headed over from Lewis McGugan's pinpoint free kick.
There was controversy on the stroke of half time when Forestieri caught Trotter high on the leg with a studs-up challenge, but D'Urso only produced a yellow card.
The game was ended as a contest three minutes after half time when Anya cut in from the let flank and arrowed a scorching drive into the top corner.
Forestieri nearly made it 4-0 when his long-range shot rattled the inside of David Forde's post and bounced clear.
Morison thought he had pulled a goal back for the Lions but the striker's close-range header was disallowed for offside.
And the linesman's flag proved equally-costly at the other end as Robinson was penalised for handball in the area, even though ref D'Urso had initially waved play on.
McGugan took over penalty-taking duties from Deeney and the attacker made no mistake from 12 yards, sending Forde the wrong way.
Watford had the ball in the net again in the 73rd minute but Forestieri was adjudged to have been in an offside position when he converted Murray's cross.
Moments later it was the woodwork that came to Millwall's rescue as McGugan's left-footer came crashing off the bar.
Hoyte went close to scoring a late consolation with a long-range drive that flew just over, but the Lions were well-beaten.