on 8 July 1945 and joined other American submarines in patrolling those waters. She encountered two small Japanese patrol vessels on 11 July 1945 and commenced a surface approach for an attacl. Although she fired 11 torpedoes, only one scored a hit, the others presumably passing under the hulls of the shallow-draft ships. By this time, Brill was inside the curve and the onset of darkness ruled out using her deck guns to sink the patrol vessels, so she broke off the attack. Another opportunity presented itself on 19 July 1945, when Brill encountered a small Japanese convoy of two merchant ships, a destroyer, and two patrol boats. she fired four torpedoes, but scored no hits. She broke off the attack at dawn and departed the area. She made no worthwhile contacts during the remainder of the patrol. On 1 August 1945, she rendezvoused with Chub to transfer her remaining gun ammunition to Chub, then set course for Fremantle, where she arrived on 9 August 1945 and began a refit alongside the submarine tender . Hostilities with Japan ended on 15 August 1945 while she still undergoing refit. Post-World War II On 31 August 1945 Brill departed Fremantle with Chub and the submarines and bound for Subic Bay, which she reached on 9 September 1945. There, she served as a unit of Submarines, Philippine Sea Frontier, until January 1946, when she received orders to Pearl Harbor for repairs to her diesel engines. After calling at Pearl Harbor, she got back underway on 5 February 1946 with only three of her four engines in operation, heading east to San Diego, California, for a period of shore leave and upkeep. She reached San Diego on 12 February 1946 and went alongside the submarine tender for repairs. After a week of refresher training, Brill departed San Diego on 23 April 1946 to return to Pearl Harbor, where she commenced an overhaul on 1 May 1946. At the conclusion of the overhaul, she resumed operations with the United States Pacific Fleet. Departing Pearl Harbor on 12 September 1946, she made a two-month cruise to Midway Atoll in the Northwestern Hawaiian Islands, Adak in the Aleutian Islands, Kodiak on Kodiak Island, and Indian Island in Puget Sound in Washington. She returned to Pearl Harbor on 9 November 1946. Brill continued training exercises around Hawaii with Submarine Squadron 5 until 4 September 1947, when she departed