Chatelain forced the enemy submarine to the surface with two depth charge attacks, then joined in the general firing at point-blank range which followed, sending U-515 to the bottom at 34°35′N 19°18′W / 34.583°N 19.300°W / 34.583; -19.300.

On 4 June 1944, Chatelain had the distinction of initiating one of the most dramatic incidents of the war, when she made a sound contact, and hurled a barrage of hedgehogs at a U-boat.

A second attack by Chatelain, this time with depth charges, holed U-505's outer hull and forced her to surface, her crew jumping overboard as she broke water.

Now the task group seized its chance to carry out the boarding operation it had been planning for months, for the first capture by Americans of an intact German submarine.

Chatelain had patrol and convoy escort duty, as well as serving as plane guard during aviation exercises, until 20 November 1945, when she arrived at Charleston, South Carolina.