The Battle of Tervissis took place in 20 BBY near the planet Tervissis, in the Sertar sector. Launching a surprise assault on Kenobi's three-cruiser fleet in space, Grievous's armada gained a swift advantage, with the Confederate Navy battleships and droid starfighters summarily eliminating the Republic Star Destroyers and their outmatched starfighter squadrons. Greivous also ordered boarding parties to the remaining two Star Destroyer's, the Negotiator and the Renown. When Grievous arrived with a boarding party of battle droids aboard the Star Destroyer Negotiator, Kenobi, along with the 212th Attack Battalion, mounted a defense of his flagship's main hangar against the droid boarding parties, but were unable to hold them back, and Kenobi ordered all personnel to abandon ship.
Before jettisoning from the Negotiator aboard escape pods with Commander Cody and their men, Kenobi activated his crippled flagship's self-destruct sequence, forcing Grievous to abandon the ship aboard a shuttle before he could plunder the military intelligence stored in its computer databanks. The destruction of Kenobi's fleet prevented him from sending Cody to aid Jedi Padawan Ahsoka Tano, who had been captured by Captain Hondo Ohnaka and his pirates while overseeing a training mission with a class of Jedi Initiates.