She was launched on 6 November 1943, sponsored by Mrs. K. G. Berrie, and placed in reduced commission on 20 May 1944 for a trip to Galveston, Texas.

She then was fitted out at the Todd Galveston Drydocks, Inc. and was placed in full commission on 3 October 1944, with a United States Coast Guard crew.

Brunswick embarked upon the first of her three round-trip convoy escort missions to North Africa on 11 December 1944.

Brunswick escorted the damaged Henry Miller into Gibraltar and then rejoined the convoy screen.

Her name was struck from the Navy List on 19 June 1946, and she was sold on 9 April 1947 to the Sun Shipbuilding and Drydock Company of Chester, Pennsylvania, for scrapping.