Arsenal slumped to a disappointing first leg defeat against Bate Borisov in the Europa League round of 32.
Stanislav Dragun nodded home Igor Stasevich’s free-kick for the game’s only goal just before half-time.
Arsenal’s Alexandre Lacazette had a goal disallowed early in the second half before being sent off for elbowing Aleksandar Filipovic.
A resolute Bate held on for the win, their first over an English side at home in European competition.