In the year 3680 BBY, specifically the second year of the Great Galactic War, a significant battle transpired in the Seswenna sector of the Outer Rim Territories. The combatants were the re-established Sith Empire and the Galactic Republic. This clash marked the second engagement within the Seswenna sector during the war. Mirroring the initial conflict, the primary objective was to dismantle the Imperial blockade on the Rimma Trade Route, a crucial super-hyperroute that traversed the region and provided vital supplies to the Outer Rim's southern regions. Unlike the first engagement in the Seswenna sector, this renewed effort yielded success. The Republic Navy, having reorganized after their previous setback, managed to overpower the Imperial Armada's forces. Consequently, the Sith were compelled to relinquish their control over the Rimma Trade Route, thereby enabling the Republic Military's access to the hyperspace lane for resupplying their troops engaged in Outer Rim campaigns, such as the contested Minos Cluster.
At the onset of the Great Galactic War, the Sith Empire initiated a widespread strategic offensive targeting Galactic Republic assets and territories within the Outer Rim Territories of the galaxy. Following the capture of the Tingel Arm and strikes against strategically significant planets like Korriban and Sluis Van, the Imperial Military launched a large-scale invasion of the resource-abundant Minos Cluster. This offensive initially met with considerable success, largely due to the Imperial Navy's strategic positioning in the Seswenna sector along the Rimma Trade Route, which effectively blockaded the super hyperspace lane. Throughout 3681 BBY, Imperial ships maintained control over the Seswenna sector, successfully disrupting Republic supply lines intended to deliver reinforcements and resources to Jedi defenders on the front lines of the Minos Cluster Campaign.
In the year 3680 BBY, one year into both the war and the blockade, the Republic Army launched an attempt to break the Sith's grip on the Seswenna sector. This counterattack failed entirely, resulting in the capture of hundreds of Republic soldiers as war prisoners by the victorious Imperials. News of this defeat caused concern among the Jedi in the Minos Cluster and further eroded Republic morale. Nevertheless, Republic Military commanders remained determined to overcome the Imperial fleet in the Seswenna sector to liberate the crucial Rimma Trade Route.
Subsequent to the initial failed attempt to break the blockade, the Republic's naval fleet, which had experienced dispersal during the retreat from the Tingel Arm campaign, underwent regrouping to initiate a renewed assault against the Imperial Armada within the Seswenna sector. The assembled fleet advanced against the blockade and successfully shattered the Empire's control over the Rimma Trade Route, thereby securing victory in the battle and re-establishing control over the vital supply line.
Word of this triumph rapidly circulated to other battle zones within the Outer Rim, resulting in heightened morale and renewed determination among Jedi defenders to persist in their struggle. In the Minos Cluster, Jedi Knight Gnost-Dural, who was engaged in combat on the front lines of the Battle of Eliad, experienced relief upon learning that the blockade's end signaled the imminent arrival of reinforcements and supplies. As the war continued to extend into subsequent years, the Republic's capacity to deploy forces along the Rimma Trade Route facilitated the re-establishment of a foothold within the Minos Cluster by its armed forces and Jedi warriors. This foothold was maintained until the war's conclusion in 3653 BBY. A record of the battle was included in the wartime journal of Gnost-Dural, which was archived within the Jedi Archives on Tython during the Cold War.
The second battle of the Seswenna sector received its initial reference in The Journal of Master Gnost-Dural, a 2011 publication authored by Robert Chestney under the in-universe guise of Jedi Master Gnost-Dural. This book was incorporated as part of the Star Wars: The Old Republic collector's edition game package and functioned as a source of foundational lore for the massively-multiplayer online video game.
- The Journal of Master Gnost-Dural (First mentioned)