Mssan was a group of 3 cargo ferries that the Galactic Empire used to ferry TIE Defender prototypes to Admiral Thrawn. When modified corvette group Hashim was disabled in an ambush by Rneekii Pirates that was driven away by Imperial Ace Maarek Stele, Mssan was called to pick up the TIE Defenders. Mssan 1 was to dock with Hashim 1, Mssan 2 was to dock with Hashim 2, and Maarek, piloting the third TIE Defender, was to board Mssan 3.
However, the first two arrived at the scene 20 klicks and a small Rebel strike force arrived with the intention of destroying the ferries. Stele left to eliminate the Rebels, but while he was engaging them another pirate faction known as the Nami sent their own strike team, capturing Hashim 1 before Stele could intervene. To further complicate matters, the rogue Grand Admiral Demetrius Zaarin sent his own TIE Defenders, which were defeated by Stele. The Rneekii returned with the Mon Calamari light cruiser Sumpntodo and Z-95 Headhunters, which were driven of by Stele.