Arsene Wenger hailed the maturity of his Arsenal side after they edged Borussia Dortmund 1-0 in the UEFA Champions League on Wednesday.
Aaron Ramsey scored his 11th goal for the season as Arsenal moved to the top of Group F with their third win from four matches.
Dortmund controlled the first hour, with Henrikh Mkhitaryan and Jakub Blaszczykowski going close, while Marco Reus had an effort disallowed for offside.
Arsenal withstood Dortmund's best though – last season's beaten finalists had 13 shots on goal to the four of their opponents – before claiming the victory thanks to Ramsey's 62nd-minute header.
Wenger told Sky Sports: "I was very impressed with our focus from the first to the last minute.
"It was a very tight game, very difficult. We didn't give them room to create chances, but then we had a difficult period at the start of second half.
"Nevertheless, we created chances and we could have scored a second. It was a very mature performance."
A delighted Ramsey added: "We kept our shape really well. We were patient and it was a great away performance from the lads.
"It was a difficult place to come we realised that from last time we came here (in 2011) and drew 1-1.
"We defended ever so well and got them on the counter-attack. They're no mugs, they got to the final last year and were unlucky.
"They're a very strong team and we had to do our defensive work very well tonight. We're over the moon with that."