- ISS Fortuna's class and registry number are not consistent and it may appear as any Imperial Starfleet battleship mob, including Vesta-class, Geneva-class, Armitage-class, and Prometheus-class variants.
In the year 2409, the Fortuna led a flotilla assembled by Captain Leeta into the Badlands. When an Allied ship from the primary universe entered the mirror universe through an interdimensional portal, the other ships engaged it but were defeated. This forced Leeta to intercede, but the Fortuna suffered damage and was forced to retreat. The Allied ship then proceeded on its course to Bajor unhindered. (STO - "Cardassian Struggle" mission: "Jabberwocky")