The clash known as the Battle of Chabosh unfolded circa 5300 BBY between the Sith Empire and a coalition of Jedi and rebels. In this battle, Sith Lord Tulak Hord spearheaded a dark side-aligned force to seize control of Chabosh, which was then under the control of Jedi and rebel forces, achieving this objective after dismantling the Jedi siege that had been placed on the planet of Yn. Hord, accompanied by his apprentice Ortan Cela, and their Dashade Shadow Killers Khem Val and Veshikk Urk, spearheaded the Sith assault. During the conflict, Urk and Val consumed the Force potential of their adversaries, while Tulak Hord employed a ritual to siphon the power of his foes into himself.
The Battle of Chabosh initially surfaced within Khem Val's profile on the Holonet segment of the official website for the video game Star Wars: The Old Republic back in 2011. Subsequently, the game itself provided further elaboration on this event, through dialogues with Khem Val and various Codex entries.