Arsenal pulled off a shock win against last year's Champions League finalists, Borussia Dortmund, with a 1-0 victory away from home to put them top of the group of death.
Aaron Ramsey scored the only goal of the night in the 62nd minute. After a superb cross from Mesut Özil, striker Olivier Giroud headed the ball across the box to Aaron Ramsey, who headed the ball into the back of the net from close range.
Ramsey almost made it 2-0 moments later but Dortmund keeper, Roman Weidenfeller, denied his close range volley.
The Welshman's goal was his 11th this season in all competitions, equalling his tally in his first six seasons combined for Arsenal.
Dortmund were unlucky not score after great efforts from Marco Reus, Jakub Blaszczykowski and Henrikh Mkhitaryan were all denied by Gunners stopper Wojciech Szczęsny.
Dortmund also had two goals disallowed, after Reus and Marcel Schmelzer’s efforts were rightfully called offside.
Arsenal hung on to the full-time whistle and claimed all three points, which all but guarantees their place in the last 16 with Marseille and Napoli still to play in Group F.
Arsene Wenger's side became the first English team to win at the infamous Westfalenstadion, and is also the first team to beat Dortmund at home this season.
The Gunners have now won 14 of their last 15 away games, and this incredible run started last March after the astonishing win at last year's Champions League winners, Bayern Munich.
Dortmund boss Jurgen Klopp said in a post-match interview that Arsenal have what it takes to win the Champions League, if they are not drawn against German giants and current title holders Bayern Munich in the early stages.
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