Western Approaches
After the United Kingdom entered World War II on 3 September 1939, "Wivern"s assignment at Portsmouth was cancelled, and instead she was assigned to Western Approaches Command for convoy defence operations in the Western Approaches. On 5 September, she escorted Convoy GC 1 from the River Clyde in Scotland with the destroyers , , and . On 9 September she joined the destroyers and in escorting Convoy OB 2.