Welbeck's first career hat-trick
Basel beat Liverpool 1-0
Atletico Madrid beat Juventus; Real win
Fulham thrash Bolton; Huddersfield win
On the stroke of half-time, Fernando Amorebieta makes it Fulham 2-0 Bolton.
Is the end nigh for Trotters boss Dougie Freedman? And is Kit Symons making himself a strong contender for the five-man selection committee at Fulham?
What a run! Alex Oxlade-Chamberlain has a written invite to run at the Galatasaray defence and politely accepts, leaving two men in his wake to burst into the box but he then doesn't know whether to shoot or pass to Meust Ozil - and in the end does neither really. Chance.
I tell you what, there will be trouble when this pedestrian Galatasaray defence comes up against Dortmund...
Image source, Getty ImagesJoseph Murphy:, external The Henry of the present day could have scored a couple against that woeful Galatasaray defence.
Henry Taylor-Gill:, external You could literally create a team of players that Man United let go that are better than their actual team right now.
Stephen Shaw:, external re: Hassan, did you just compare Henry to Zidane? Good, but never that good. And never the best in the world
And we are back playing in Switzerland too. Paulo Sousa and Brendan Rodgers have met as managers before - and it's ended 0-0. Goals tonight?
Back in play at the Emirates then. Hat-trick for Danny Welbeck? Hamit Altintop comes on for Yekta Kurtulus for the Turkish side at the break.
Alexis Sanchez's crisp finish tonight ends a run of 17 Champions League games without a goal for the Chilean forward. He last scored in the competition for Barcelona v Benfica in October 2012.
Image source, Getty ImagesCheck out some of the best photos from tonight's Champions League ties on the BBC Sport Facebook page., external
Aham Ebogu:, external No one said Welbeck is the new Henry, but HE CAN be, and why not? Remember Henry was not the Henry he later became.
Abhinav Reddy:, external Brendan Rodgers maybe leader of men, but he clearly isn't a 'buyer' of men. Markovic the latest casualty.
Bilaal:, external United fans don't feel like we let one go, happy that Welbz is doing well but we don't have any issues going forward.
Image source, PAI'm not going to argue with Martin Keown - he's a lot bigger than me and has just been talking about finishing people off when he's got his foot on their neck - but Danny Welbeck has currently scored 148 fewer Premier League goals than Thierry Henry.
If the 23-year-old does turn out to match that figure then Arsenal are in for quite a few excellent years.
Image source, PAHalf-time in two of the Championship's games and Huddersfield are now 2-0 up at Wolves in a potential surprise result. Sean Scannell has scored their second.
Leeds and Reading are goalless at the break, while Fulham are beating Bolton 1-0 in the 20:00 BST kick-off.
The last goal of the first half was scored by West Brom legend Markus Rosenberg for Malmo, who lead Olympiakos 1-0.
Real Madrid are still being held 1-1 by Ludogorets Razgrad, while Bayer Leverkusen lead Benfica 2-0 and Borussia Dortmund are 1-0 up at Anderlecht.
Former Arsenal defender Martin Keown
BBC Radio 5 live
"This is the best performance of the season by a long way. Everything's starting to click for Arsenal. Galatasaray's fans have made a lot of noise but their team certainly hasn't.
"It's what Arsenal are capable of. I hope they don't sit on this and there is that temptation with Chelsea coming up. When you've got your foot on the neck, keep it there and finish the job off, have a big night and send ripples across Europe.
"This is a new team and a new beginning. Danny Welbeck has looked magnificent and he's enjoying the opportunity of scoring goals. It's the pace that gets him there. It looks easy but he gets away and just slides it into the corner.
"Thierry Henry said he always picked one spot and relied on sliding it in there and why can't Welbeck do that?"
Liverpool's best bet may lie on the counter attacks, and they've had just 42% of the possession so far. With these two sides arguably likely to be fighting for second place behind Real Madrid in the group, is a draw a good result tonight for the Reds?
Image source, Getty ImagesAnd half time in Switzerland too. Brendan Rodgers and Mario Balotelli share a grimace, it's been one of those halves.
Half time at the Emirates - a job very well done for Arsene Wenger and his side so far.
Will Banks: No, Welbeck isn't like Henry - he can head the ball too!
Hassan from London: To those even saying Welbeck is/can be as good as Henry, madness I say! Henry was the best player in the world in 2004 when the likes of Zidane, Ronaldo and Figo were at Madrid alone. Do you really think one day we will say Welbeck was the best in the world? No!
Gwilym J. James:, external If the match gets abandoned it'll only be a 3-0 loss which at this rate is probably Gala's best hope.
Martin Keating (United fan):, external Welbeck was not going to get games or the position at United. I'm happy for him he can do what that elsewhere.
Andile Maseko:, external Danny Welbeck isn't anywhere near being Thierry Henry. But like Sturridge did at Liverpool he could come good this year.
Arsenal may be hitting their peak but Liverpool have had a quiet few minutes in Switzerland, though Raheem Sterling does lace in an effort from 20 yards which is easily held. From a corner Dejan Lovren then heads down into the turf. Frustration for Brendan Rodgers.
Image source, Getty ImagesFormer Arsenal defender Martin Keown
BBC Radio 5 live
"Sanchez made a really good run and Ozil put him in. Again it was a lovely side-foot pass into the corner. Arsene Wenger was inspired playing Sanchez on the left tonight, coming back onto his right foot.
"The Galatasaray fans have flares but the fireworks have been from the Arsenal team and they've been too much for Galatasaray.
"When Arsenal turn up the speed of their play to this level there are very few teams that can live with them."
Image source, EmpicsBayer Leverkusen are 2-0 up against Benfica thanks to goals from Stefan Kiessling and Son Heung-Min. Both sides lost their opening games.