The only capture by American forces of a German submarine on the high seas during the war, this dramatic operation provided essential intelligence for future antisubmarine warfare.

Between 15 July 1944 and 7 November, Flaherty completed two more hunter-killer patrols with the Guadalcanal group, then served as school ship for the Naval Training Center at Miami, Florida.

This was her base for duty on the barrier line established in the last months of the European phase of the war to prevent desperate U-boats from penetrating the western Atlantic.

Flaherty returned to New York 11 May 1945, and 2 weeks later sailed on convoy escort duty to Le Havre, France, and Southampton, England.

She returned to duty guarding carriers training off Norfolk and Charleston, South Carolina, until arriving at Green Cove Springs, Florida, 12 January 1946.