Destruction of the Vanqor listening post During the Clone Wars , the Galactic Republic launched a mission to destroy a Confederate listening post on the planet Vanqor . However , the Jedi Master Quinlan Vos , who was secretly working for the Separatist leader Count Dooku , leaked intelligence about the operation to the Separatists . As a result , the Separatist were able to evacuate the listening post well before Republic forces arrived . When Republic forces and Jedi forces arrived , they found that the listening post had already been abandoned . As a result , the Jedi Order came to suspect that they had a traitor within their ranks . Prelude . Following a failed Jedi and Republic operation to extract supplies from a Separatist supply storage base , the Jedi Master Quinlan Vos was praised for saving his Jedi comrades by warning them about the presence of explosives in the asteroid base . Deeming him worthy to fight the Separatist , the Jedi High Council sent Vos to lead an operation to destroy a Separatist listening post on the planet Vanqor . Quinlan had been captured earlier during a mission to assassin ate Count Dooku and had spent several months in Separatist captivity . As " Admiral Enigma " , Vos gained an extensive knowledge about Separatist military strategy . For this mission , Master Vos was accompanied by Master Obi - Wan Kenobi and the Jedi Knight Anakin Skywalker . Unknown to the Jedi however , Vos had embraced the dark side of the Force and become Dooku ' s Sith apprentice . In reality , this was merely a ruse for Vos to get Dooku to lead him to his master Darth Sidious so that he could destroy the Sith once and for all . To perpetuate the ruse that he was still loyal to Dooku , Vos leaked information about the planned operation to the Separatists . As a result , Dooku was able to evacuate the listening post before Republic forces arrived . The mission . Expecting heavy resistance from Separatist droid fighters , Kenobi , Vos , and Skywalker flew three Eta - 2 " Actis " - class light interceptors . They were accompanied by twenty - four ARC - 170 starfighters which formed the first attack wave . As they descended into Vanqor ' s atmosphere and approached their target , the three Jedi were baffled to encounter no resistance . While the Jedi and the first wave approached the listening post , Kenobi ordered Admiral Block to dispatch the second attack wave because he suspected that the Separatists had set another trap . As the Jedi starfighter s approached the listening post , Vos " observed " that it had been abandoned . To be sure that this was the case , the three Jedi starfighters embarked on a strafing run in order to flush out any stragglers . While their blast destroyed the listening post ' s main dish and tower , their scanners were unable to detect any ships , vehicles , people , droid s , or animals below . Later , the Jedi landed at the listening post where they were joined by several Clone trooper s led by Clone Commander Cody . After inspecting the interior , the Jedi and clones deduced that Count Dooku had received intelligence about the operation and evacuated the facility . As a result , Kenobi and Skywalker came to rightfully suspect that there was a traitor within their ranks leaking information to the Separatists . Aftermath . Following the failed Vanqor operation , the Jedi Order came to suspect that a traitor was leaking information to the Separatists . Due to Master Vos ' captivity under Dooku , suspicions fell on Quinlan Vos . After meeting with Vos in private , Master Yoda was able to deduce that Quinlan had indeed fallen to the dark side . Unsure whether this meant that he had committed himself to Count Dooku , the Jedi Council assigned Vos with a mission to assassinate Dooku . If he succeeded , he would be considered innocent . But if he failed , this was enough evidence to prove that he was a traitor . After receiving intelligence that Dooku ' s " Providence " - class dreadnought was visiting Christophsis , Vos and his lover Asajj Ventress traveled there on her ship , the " Banshee " . Unknown to Vos , the Jedi had sent Kenobi and Skywalker to tail him . Using a stolen Separatist shuttle , the two Jedi managed to follow Vos aboard the dreadnough . There , they discovered Vos trying to force Dooku to lead him to his master Darth Sidious . Confronted with evidence of Vos ' treason , the two Jedi promptly arrested him . However , Vos and Dooku managed to escaped , leading to a Republic assault on Christophsis .