In 3671 BBY, during the Great Galactic War between the Old Republic and reconstituted Sith Empire, the Seswenna sector in the Outer Rim Territories was attacked and seized by Sith forces. This military operation finalized the Imperial conquest of the Outer Rim and allowed for the Sith Emperor to initiate plans for an attack on the Mid Rim, specifically the Republic-allied world of Bothawui.
When the once-decimated Sith Empire returned to the galaxy and initiated the Great Galactic War, it focused its operations in the Outer Rim Territories—a region weak in both Galactic Republic loyalty and defense priority. The Sith Emperor was highly successful in his campaigns in the region and quickly claimed victory in the Aparo sector, the Sluis sector, the Rimma Trade Route, and the entirety of the Tingel Arm, among other territories. The Empire initiated a blockade of the Rimma Trade Route in that first year of the war, but their fleet, stationed in the Seswenna sector, was defeated by the Republic Navy one year later.
While Republic leaders remained incapable of deciding a proper response to the Empire's attacks, the Empire returned to the Seswenna sector in 3671 BBY and retook the region, thereby finalizing the Imperial conquest of the Outer Rim. Among the casualties of the battle was Republic Captain Joron Tal'vor, the husband of Republic Army officer Elin Garza.
The capture of the Seswenna sector marked a turning point in the war. Confident that the Outer Rim was no longer in need of the undivided attention of his military, the Emperor began plans for an incursion into the Mid Rim—one step closer to the Core Worlds of the Galactic Republic. Less than a week after the victory in the Seswenna sector, the Imperial Armada sent a strike fleet to attempt a seizure of the world of Bothawui. The attack was predicted by Admiral Greik of the Republic Navy and so met with failure, but the Emperor would attempt another attack shortly thereafter. Sometime after the signing of the Treaty of Coruscant, which ended the war, Jedi Master Gnost-Dural made mention of the capture of the Seswenna sector in a holorecord for the Jedi Archives.
The Sith Empire's seizure of the Seswenna sector was first mentioned in the fifth installment of the Galactic Timeline, entitled The Battle of Bothawui. The Galactic Timeline is an online promotional feature for the LucasArts / BioWare 2012 video game Star Wars: The Old Republic. The installments are available through The Holonet section of the official Old Republic Web site.
- The Journal of Master Gnost-Dural
- Star Wars: The Old Republic Encyclopedia