Manchester United left north London with all three points in the bag on Saturday, despite playing out a frenetic contest at the Emirates with 10 men.
The Red Devils made a blistering start to the tie, getting themselves in front within 10 minutes courtesy of Antonio Valencia, before Jesse Lingard continued his personal goalscoring run and doubled the lead sooner after.
The England international added his second following a comeback strike from Alexandre Lacazette, before Paul Pogba saw red for an ugly challenge on Hector Bellerin.
While all eyes were trained on every kick of the football, Sportsmail kept a broader look about the Emirates to pick out some of the things you may have missed.
Steady on now
United were in such a rush to dive head first into the contest that they went too quickly even for the referee's liking.
Jose Mourinho's men started the game in a blur, resulting in ref Andre Marriner to pull back play and get Arsenal to take kick-off again.
Undeterred by the halting of their eager nature, United soon kicked on and had the ball in the back of the net within ten minutes. Now that's efficient.
Manchester United were that keen to get going they were in the Arsenal half before kick-off
Play was pulled back by the referee so the game could be started correctly
A three year wait, then two come along at once
The Red Devils had failed to breach the back of the Arsenal net at the Emirates since 2014.
On that occasion, three years ago, a certain Wayne Rooney was the goalscorer.
Today, United washed away that memory with a smash and grab first half which saw the Gunners goal budge twice before the ripples had even settled.
Jesse Lingard's effort followed Antonio Valencia's with such pace that Arsenal were left shell-shocked. Just what Mourinho ordered.
United broke a three year duck by scoring at Arsenal - the first