After shakedown out of Bermuda, Gantner escorted SS George Washington from Puerto Rico to New York, arriving there on 1 December 1943. She departed New York on 26 December 1943 as a part of the escort for a convoy which reached Derry, Northern Ireland on 8 January 1944. She returned to New York on 24 January and by 8 October had made seven more trans-Atlantic escort voyages from that port to Derry.
Gantner departed Tokyo Bay on 12 October 1945 to embark a returning Marine contingent at Apra Harbor, Guam, and sailed thence via the Marshalls and Hawaii to San Diego where she disembarked military passengers on 1 November 1945.
1946–1949
For the next three years she was based at San Diego, largely employed as an amphibious warfare training ship for Marines. From 26 January to 6 March 1946 she made a cruise from San Diego with the 1st Marine Division Reconnaissance Detachment for cold weather maneuvers that took her to Kodiak, Juneau, Tolstoi Bay and Clarence Strait, Alaska. Her amphibious schedule on the California coast was again interrupted on 28 October–18 November 1948 by a cruise northward to act as guard ship on weather and air-sea rescue patrol station for Navy patrol planes scouting north to Seattle, and thence back to San Francisco.
Gantner resumed her amphibious training out of San Diego until 19 January 1949 when she sailed for Shanghai, China. She reached her destination on 14 February and served on station at the Chinese ports of Shanghai, Nanking and Qingdao. Departing the last named port on 7 April, she accompanied the escort carrierRendova (CVE-114) to Yokosuka, Japan, then sailed via Guam and Pearl Harbor for the west coast, arriving at San Diego on 4 May 1949.
The ex-Gantner collided on 17 April 1966 with ex-Walter B. Cobb (former APD-106), while both were under tow to Taiwan, resulting in the loss of ex-Walter B. Cobb. Ex-Gantner was commissioned into the Republic of China Navy in May 1966 as frigate Wen Shan (PF-34). With a different hull number, 834, Wen Shan was scrapped in 1991.