The "Thirteenth Fleet" was the name given by the press to a group of Federation and Klingon starships that became trapped behind enemy lines at the beginning of the Dominion War. (Star Trek: Liberty, Star Trek: The Adventures of Argus) Shortly after taking command of the USS Argus, Jonozia Lex found the reported activities of the fleet to be a source of hope, especially as the fleet was rumoured to be led by the Argus' sister ship, the USS Liberty. (Star Trek: The Adventures of Argus: "Trial By Fire")