Arsenal won their biggest victory of the season against the best team they've played in the toughest venue they've traveled to.
With their backs to the wall in their Champions League group, and as Napoli beat Marseille, Arsenal defeated Borussia Dortmund 1-0 thanks to a goal from Aaron "The New Zidane" Ramsey—his 11th of the season.
The Gunners remain at the top of Group F, ahead of Napoli on goal difference and goals scored. Arsenal have to play Napoli and Marseille once more each before the group stage is done.
Let's look at six things we learned from their vanquishing of Dortmund.