The Gunners picked up an invaluable 1-0 win over the German side on Wednesday night.
Arsene Wenger and the travelling support will be delighted with Arsenal’s performance at Signal Iduna Park on Wednesday night.
Here are five things we have learned about Arsenal after the win.
Midfield learn from first game
Mathieu Flamini has been absent for both games against Jurgen Klopp’s men, and he was missed in the first clash in England. Both Henrikh Mkhitaryan and Marco Reus were prominent in the first clash, but Arsene Wenger set his side up in Germany to avoid a repeat of this.
Mikel Arteta, Tomas Rosicky and Ramsey all worked hard and were disciplined, with a solitary first-half chance for Mkhitaryan the only moment where the Dortmund attacking midfield duo got considerable time and space to operate.
Renowned for silky passing and keeping the ball on the deck, Arsenal looked a real threat from set-pieces and were unlucky not to get a second goal as a result.
Both Per Meresacker and Laurent Koscielny threatened in the air, while Olivier Giroud got a decisive header for the only goal of the game.
Ramsey has the midas touch
Despite the absence of Flamini and added responsibility defensively, the Wales international continued his rich vein of scoring form and was a threat going forward.
His energy and work rate were unparalleled and both Sven Bender and Nuri Sahin found it difficult to contain the effervescent midfielder.
Another rounded performance from a player that looks set to be a world beater for years to come.
Wenger spots danger on Arsenal’s left
Dortmund got most of their joy down their right flank, with Jakub Błaszczykowski and Kevin Grosskreutz doubling up against Kieran Gibbs.
The Arsenal defender did all he could, but the attack-minded Santi Cazorla did get caught up the pitch at times and the left-back found himself outnumbered.
Wenger spotted this imbalance and made a change in the second half to neutralise the threat, with Nacho Monreal coming on for Cazorla to plug the gap defensively.
Giroud looking fatigued
Olivier Giroud put in his standard hard-working shift and had an influence in the game, but in the second half the France international looked leggy and was guilty of giving the ball away.
Nicklas Bendtner did replace him at the death, but with Arsenal clinging onto the lead, the visitors were crying out for a mobile striker to chase things down and hold the ball up.
Had Wenger had more faith in Bendtner, the Dane would have been on earlier in the clash, and it appears that Arsenal certainly need a new back-up centre forward as a matter of urgency in January.
image: © peterfuchs