Jacob Bruun Larsenâs stunning strike made it 2-1 just one minute after Elijah Adebayo had drawn the Hatters level.
By Sam Wallace, at Old Trafford
After cruising past PSV Eindhoven in their first match on their return to the top tier of European football, Arsenal might have been forgiven for thinking that the Champions League was far easier, and far more enjoyable, than they remembered from all those years ago. Those notions, it is safe to say, have now been disabused.