Mssan constituted a trio of Cargo ferries utilized by the Galactic Empire for the purpose of transporting prototype TIE Defender units to Admiral/Legends Thrawn. Subsequent to the incapacitation of the modified corvette group designated Hashim resulting from an ambush orchestrated by Rneekii Pirates who were subsequently repelled by Imperial Ace Maarek Stele, the Mssan ferries were dispatched to retrieve the TIE Defenders. The designated plan involved Mssan 1 docking with Hashim 1, Mssan 2 docking with Hashim 2, and Maarek, piloting the third TIE Defender, embarking aboard Mssan 3.
However, as the initial pair of ferries approached the location, situated 20 Klicks away, a modest strike force affiliated with the Rebel alliance materialized, intending to obliterate the ferries. Stele departed to engage the Rebel forces, but during his engagement, a separate pirate faction identified as the Nami dispatched their own assault team, successfully seizing control of Hashim 1 before Stele could intervene. Further complicating the situation, Rogue Grand Admiral Zaarin deployed his own TIE Defenders, which were ultimately defeated by Stele. Subsequently, the Rneekii reappeared, accompanied by a Mon Calamari light cruiser named Sumpntodo and Z-95 Headhunters, but Maarek Stele drove them off.