And it's all over.
David Moyes picks up his 200th Premier League victory on his 20th anniversary as West Ham go five points clear of the relegation zone.
Huddersfield remain four points clear but they have two tough fixtures to follow - away to Stoke before hosting Jurgen Klopp's Liverpool.
The stadium is half empty now. It's literally just the final whistle people are waiting for now. David Wagner will no doubt have his mind already on Huddersfield's trip to the Bet 365 Stadium.
On his 20th anniversary as a manager, David Moyes is about to become just the fourth boss to win 200 Premier League games.
He's standing alongside good company - Sir Alex Ferguson (528), Arsene Wenger (468) and Harry Redknapp (236.)
It also means the Hammers will go five points clear of the relegation zone. What a turnaround they have made!Copyright: Getty Images
Well, there's jeers and booing from the home supporters but that can only mean one thing. Marko Arnautovic is coming off.
He ran the show for West Ham today and after returning from injury, it's a wise decision from Moyes to bring him off before full-time.
A goal and two assists for Arnautovic - and my man of the match.
The home fans aren't content with sitting back though.
Some of them are getting off their seats and slowly making their way to the exits. It's not been an enjoyable second half for them at all...
The game has fizzled out a little bit in these last five minutes but that's understandable given West Ham's three-goal lead.
They look content to sit back for a bit and allow Huddersfield possession.
Just a reminder that Huddersfield have only lost at home on three occasions this season.
Their opposition? Manchester City, Chelsea and Tottenham. That puts into perspective what a great win this would be for David Moyes' West Ham.
Alex Pritchard has already made a good impression. He drives forward from midfield, earns a free-kick and almost scores on his debut!
He fires it low into Adrian and the West Ham keeper can only deflect it into the path of several players before it's cleared for another corner.
Skipper Tommy Smith is off and that means there's a second league debut for Huddersfield defender Terence Kongolo.
I'm sure he would have liked a better introduction than this but that's football...
Huddersfield are still fighting and there's a goalmouth scramble to head the ball in the West Ham box.
Pablo Zabaleta goes down clutching his head and his team-mates immediately call for medical attention.
He's fine though and he's already up on his feet and running around again.
Here he is.
It's Alex Pritchard making his league debut for Huddersfield. He signed on a three-and-a-half-year deal from Norwich City earlier this week.
I can't keep up! The goals are flowing for West Ham now.
I probably don't even need to tell you who was involved again as it was the same devastating duo...
Marko Arnautovic drives into the box, beats two players before being brought down. Manuel Lanzini is following up, takes it on his right and fires it past a helpless Jonas Lossl.Copyright: Reuters
The hosts need to re-group. They have had an awful start to this second half and there's a danger West Ham could add more.
Mooy looks to create something but his cross is deflected out for a corner. The corner is over-hit and West Ham are eventually awarded a goal-kick.
It's that man Marko Arnautovic who is at the heart of everything yet again. He skips past Christopher Schindler then plays Manuel Lanzini in.
The Hammers midfielder cooly slips it past Jonas Lossl and it's as easy as that.Copyright: Reuters
Goalline technology confirms the ball didn't cross the line by the way.
I know how much everybody loves talking about new technology in football...
How did that not go in?
Collins heads towards goal from the corner and it bounces dangerously in front of the goalline.
It ricochets off several players before hitting Cheikhou Kouyate and Aaron Mooy has to stick a foot out in desperation to clear the ball off the line.
I mentioned prior to kick-off that Arnautovic could prove to be a huge boost for West Ham today and he has done just that.
They really missed him against Spurs but he's looked lively today and that goal could see the Hammers move above their opponents in the Premier League table.
The Terriers have got to come from behind again here. But they have 41 minutes (or so) to do it so we could be in for a treat.
Wow! That was quick!
Out of nowhere, Arnautovic snatches away possession, drives forward then smashes his shot into the top corner.
I almost choked on my drink!Copyright: Reuters