Battle of Thustra A battle took place on the planet Thustra in 21 BBY , approximately seventeen months after the first battle of the Clone Wars , between the armed forces of the Galactic Republic and the rebellious Sephi people . Through their ambition to follow the example of the Separatists , a faction of the Sephi increasingly lobbied for their homeworld to be declared an independent state from the Republic . The response from the ruling galactic power was the dispatch of a Jedi - led clone task force . But with Thustra under military occupation , the secessionist faction used the situation to incite more of the Sephi to supporting rebellion . The Sephi ' s discontent with Republic rule soon turned into hostility and open acts of defiance . Through a combination of guerrilla warfare and terrorist tactics , the subversives tried to weaken the Republic occupation force through attrition . Despite the fact that such aggression clearly constituted as acts of treason and war , the government on Coruscant hoped to find a resolution to the dilemma that resulted with Thustra ' s continued allegiance to the Galactic Republic . Yoda , the Grand Master of the Jedi Order and the leading member of its ruling body , personally undertook the assignment as an emissary of the Republic . Upon Yoda ' s arrival on Thustra , however , the Grand Army and its Jedi officers were in a desperate situation . Two Jedi Generals , Tyffix and Tyr , were murdered by a terrorist surprise attack . Their deaths left the young Commanders Cal and Pix in charge of the occupation . Yoda , with Cal at his side , departed for the capital city of Thustra in a final attempt to negotiate a cessation of hostilities between the Republic and the Sephi ; Padawan Pix and Commander Clutch were ordered to remain behind in command of the occupation force . Prelude . Seventeen months after the First Battle of Geonosis , the Sephi government of the planet Thustra switched its allegiance to the Confederacy of Independent Systems , and thereby joined the rebellion against the Galactic Republic . In response to the Sephi ' s act of treason , the Grand Army of the Republic dispatched an armed force of clone troopers under the command of Jedi Generals Tyffix and Tyr . It was hoped that a significant display of military might and the threat of force would be sufficient at dissuading the Sephi from further acts of treachery . Instead , however , the Sephi attacked the Republic ' s military outpost on the day when the Jedi and their clone forces arrived . Republic forces were almost immediately overrun by the natives . Much of its defense grid had been destroyed , particularly in the southern perimeter . A suicide bomber crashed a Sephi flyer into the Republic command center , and thus killed Tyr and Tyffix . With both Generals dead , command of the Republic forces fell to their respective Padawans , Commander Pix and Commander Cal . As the situation deteriorated , Pix sent a distress call directly to Coruscant , the capital world of the Galactic Republic . The message was received in the Republic Executive Building where it was observed by Grand Master Yoda , Master Mace Windu , Master Oppo Rancisis and Supreme Chancellor Palpatine . Due to the fact that the Sephi rebellion was supported by Thustra ' s own ruler , King Alaric , Windu believed that appeasement was unwise ; Thustra had to be subdued by the application of force , rather than just the mere threat of it . Palpatine was absolutely adamant that Thrusta could not be allowed to withdraw from the Republic as the cost would be too great . Given Alaric ' s influence within his own region , the Chancellor pointed out that the entire Sumitra sector was capable of seceding from the Republic if Thustra was allowed to do so . As an old friend of the King , Yoda hoped to convince Alaric to renew Thustra ' s loyalty to the Republic . The Battle . Shortly after arriving on Thustra , Yoda traveled to the Sephi capital city with only Cal accompanying him . Pix , who remained behind to command the Republic ' s armed forces , was under strict instructions to not move against the Sephi , so as to not undermine Yoda ' s negotiation attempt . Although Alaric was willing to speak with the Grand Master of the Jedi Order , neither of the two old friends were able to sway the other from their views . Alaric , who argued that the Republic was broken and corrupt , insinuated that the Republic could eventually betray the Jedi who defended it . However , Yoda remained resolute in his allegiance to the Republic , thus leaving the two at an impasse . After the King placed the Jedi under house arrest , Senator Navi of Thustra , a loyalist but corrupt politician , moved to manipulate the Republic into restoring order on Thustra through military force . First , he provided Cal with information that would enable the Jedi to escape from the palace . Navi then informed Pix that Yoda and Cal had been executed on King Alaric ' s orders . The young Jedi Commander was convinced by the Sephi Senator ' s deception and , as Navi predicted , retaliated with an all - out attack on the Sephi capital . In order to ensure a Republic victory , Navi provided Pix with the most recent Sephi troop movements , as well as information on Alaric ' s palace . At the same time , Moje , an aide to Senator Navi , discreetly circulated rumors of a Jedi plot to assassinate Alaric , and thus incited even greater anti - Republic sentiment amongst the Sephi . Commander Pix , along with Commander Clutch at her side , personally led the clone troopers into battle against the Sephi forces that stood between the Republic ' s army and the capital of Thustra . While Pix and Clutch commanded the ground forces during the firefight , the Republic launched an aerial bombardment on the Sephi , resulting in many enemy casualties , including Commander Dekluun . Meanwhile , Cal and Yoda were attacked by the King ' s palace guards , resulting in Cal ' s death . Yoda moved to confront his former friend alone , only to discover that Alaric decided to die as a martyr in order to further incite the Sephi to rebel against the Republic . Although his goal was achieved , Alaric , in his dying moments , begged Yoda to remember their friendship as it was in the past , rather than what it had become due to the Clone Wars . Aftermath . On Coruscant , Senator Navi attempted to use the situation on Thustra to his advantage in order to gain support from his fellow delegates in the Galactic Senate . However , he was caught by surprise when Yoda , Pix and Clutch entered the rotunda of the Senate Building where they revealed the Sephi politician ' s duplicity to the other senators . Navi was arrested and charged with treason , but the Republic ' s withdrawal from Thustra enabled the Sephi to secede from the Galactic Republic .