A young Arsenal side secured a penalty shootout win against Angers after Reiss Nelson's strike earned a 1-1 draw in regular time in France on Wednesday night.
The Gunners fell behind in the 13th minute when Farid El Melali streaked through the heart of the visiting team's defence to round Emiliano Martinez and slot into an empty net.
Angers nearly doubled their advantage when Mateo Pavlovic stabbed in from close range, only for it to be ruled out for a foul, before Shkodran Mustafi flicked an effort just wide at the other end.
Arsenal equalised minutes after the restart when Nelson converted from close range, tucking in after Eddie Nketiah's shot was blocked.