She was sunk by gunfire, Frost taking 13 of her crew prisoner. A two-hour attack on 3 July, during which the target submarine attempted to torpedo Frost, resulted in the sinking of U-154.
The German submarine U-154 met its demise after being hit by gunfire, with Frost managing to capture 13 of its crew members. On July 3, a two-hour battle ensued, in which the submarine attempted to launch a torpedo at Frost but ultimately succumbed to the attack.