On 17 October, she finished her uneventful third patrol at Rosyth. On 28 October Starfish left Rosyth for a patrol in the North Sea, off Dogger Bank.
Starfish's routine operations led to its completion of an uneventful third mission at Rosyth on 17 October. The next day, it set sail from Rosyth for a standard patrol in the North Sea, near the Dogger Bank area.