Attack on Okator VIII
Shortly preceding the conclusion of the Tionese War, which pitted the Galactic Republic against the Honorable Union of Desevro & Tion circa 23,900 BBY, a Tionese military contingent attacked Republic settlements located on the celestial body known as Okator VIII.
Sources
- Star Wars: The Essential Guide to Warfare Author's Cut, Part 4: The Rise of the Republic on StarWars.com (article) (backup link) (First mentioned)