Battle of Sullust ( 4 ABY ) The Battle of Sullust was a confrontation between the Alliance to Restore the Republic and the Galactic Empire , fought during the Galactic Civil War in 4 ABY . The battle was an attempt to lure the Imperial Navy away from the forest moon of Endor in preparation for the upcoming Battle of Endor . Commander Col Serra ' s unit , Renegade Squadron , participated in the battle , which would turn out to be a trap laid by the local Imperial officer . The squad held their own until the planet was liberated . However , Palpatine saw through the Alliance ' s plan and did not send the Imperial Navy to Sullust , as the Alliance predicted . Prelude . In 3 ABY , Han Solo , founder of the Renegade Squadron unit , was frozen in carbonite by Darth Vader and taken by bounty hunter Boba Fett , brought to Jabba the Hutt . Despite not having a commander , the unit continued to fight and achieve victory over the next year . In 4 ABY , a team led by Luke Skywalker infiltrated Jabba ' s Palace and freed Solo . The unit now complete , Commander Col Serra launched an attack on Korriban , where Emperor Palpatine was making a Sith pilgrimage . The Emperor ' s shuttle contained databanks of sensitive information on his schedule , and while he was trapped in a Sith tomb by the unit , a soldier stole a databank from the shuttle , which was later used it to confirm that the Emperor would be on the Death Star II during the Alliance ' s attack on it . The Rebels planned to use the same hyperlane than the Imperials to reach Endor , where the incomplete second Death Star was located . A Rebel fleet amassed in the Sullust system where began the route . The Rebel forces then attacked the planet in order to lure the Empire . They want the Emperor to think the planet Sullust itself was the target of the Rebels , not the Death Star . Renegade Squadron was then deployed to capture the Imperial Garrison stationed on the planet . The battle . After the unit landed on the planet , they quickly stormed the Imperial outpost , which suspiciously had little to no defenses . Alarmed , Col Serra contacted Alliance command to inform them that the unit might have fallen into some sort of trap . His suspicions were correct , as an unidentified IG - 88 unit appeared and ambushed the unit . It was equipped with a shield , rendering it invulnerable to blaster fire . Serra thought of this as a sort of " payback " to Renegade Squadron for humiliating Darth Vader during the Battle of Hoth . Nevertheless , the unit quickly picked up on the source of the shield , a lightning conduit , which was quickly destroyed . The droid became vulnerable , and the unit forced it to retreat , but not before causing heavy damage to the droid . Following the IG - 88 ' s retreat and the rebel fleet jumping into hyperspace to Endor , leaving behind 2 MC80 Star Cruisers behind , a number of gravity well projectors were activated , preventing any escape for the Renagade Squadron . To disable the gravity wells , the shield generator would have to first be disabled . The lone Imperial officer carrying the codes was assassinated , and his codes were taken by a Renegade Squadron soldier and downloaded into the shield mainframe . Now vulnerable , the gravity well projectors were destroyed . The unit would continue to hold off Imperial reinforcements until Sullust was liberated , after which they were forced to pull out due to the imminent Battle of Endor , where they were required to be present . Aftermath . Darth Vader was notified of the Rebel presence in the Sullust system and gave these reports to Emperor Palpatine , who paid little attention to them , instead focusing on his own plot to destroy the Rebel fleet over Endor . Renegade Squadron realized they had been unsuccessful , soon heading to Endor to assist General Han Solo in battle . The liberation of Sullust would be the unit ' s battle , before its disbanding . Behind the scenes . " Reports of a Rebel fleet massing near Sullust " were first mentioned by Darth Vader in , and the gathering was featured in " " . The Expanded Universe never elaborated any further on the said event until " " was released in 2007 , giving the details of the battle . Jokingly commenting on the battle , game programmer Mark said :