Manager Arsene Wenger said Arsenal were “in trouble” in their Europa League quarter-final second leg before recovering to beat CSKA Moscow.
The Gunners, 4-1 up after the first leg, were trailing 2-0 in Moscow before Danny Welbeck and Aaron Ramsey scored late goals to seal a 6-3 aggregate win.
“Maybe we were surprised by the intensity at the start,” Wenger said.
“They scored the second, had a chance for the third. It was a good response from us after the break.”
The hosts, who led through Fedor Chalov and Kirill Nababkin, went close to drawing level on aggregate and leading on away goals as goalkeeper Petr Cech saved Aleksandr Golovin’s free-kick and Sergei Ignashevich shot narrowly wide.