Arsenal beating Real Madrid 3-0 is an absolutely incredible result.
I think to be able to have games and moments like that at home, with your fanbase there, with everybody tuning in, and to walk off with a lead like that, makes it one of the marquee games of the competition so far.
Going into a second leg in the Bernabeu in the Champions League knockout you should never be too comfortable.
But I think it is vindication for Mikel Arteta and his players who have always believed they can compete.