Frida Maanum's first-half goal proved enough to see off Rosenborg as Arsenal sealed their passage to the second round of Women's Champions League qualifying.
Maanum had the easiest of tasks to slot home what proved to be Arsenal's winner in the 19th minute after a mix-up involving Rosenborg goalkeeper Rugile Rulyte and defender Mathilde Harviken.
Arsenal go through to the next stage of the competition, which is a knockout tie played across two legs. The fixtures will be decided by a draw on September 9.
More to follow...
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What's next?
Arsenal kick off the 2024/25 Women's Super League campaign this month with a clash against last season's runners-up Manchester City.
The game will kick off at 12.30pm on September 22 and you can watch it live on Sky Sports+.
It will be the first of eight home games played at the Emirates Stadium this season, after the venue was confirmed as the new main home for Arsenal Women.