Cisco reported to the
United States Pacific Fleet. She sailed from
Panama on 7 August 1943 for
Brisbane, Australia, arriving 1 September to assume local patrol duties, until 18 September, when she docked at
Darwin, Australia. She put out on her first war patrol 20 September 1943, but never returned. Japanese records tell of sighting a submarine leaking oil on 28 September in an area where Cisco is known to have been the only submarine then operating. Japanese records state this submarine was sunk by bombs and
depth charges. Japanese records state that the submarine was attacked by
Nakajima B5N (
Allied reporting name "Kate") attack bombers of the 954 Naval Air Squadron and the
gunboatKaratsu (originally the U.S. Navy gunboat
USS Luzon, captured by Japanese forces and put to work against her former owners).[8]Cisco is thus presumed to have been lost in action 28 September 1943. The only survivor from the crew was taken sick in Darwin and sent ashore to the Navy hospital prior to Cisco's final voyage.
^
abcdefgBauer, K. Jack; Roberts, Stephen S. (1991). Register of Ships of the U.S. Navy, 1775–1990: Major Combatants.
Westport, Connecticut: Greenwood Press. pp. 275–280.
ISBN0-313-26202-0.