Battle of Ossus ( Second Galactic Civil War ) The Battle of Ossus , also known as the Massacre on Ossus , took place in 40 ABY during the Second Galactic Civil War . The battle was between the Jedi of the academy and Galactic Alliance Guard ( GAG ) Troopers sent by Jacen Solo to threaten the New Jedi Order . The battle ended in the Jedi capturing the GAG troopers , with Kam Solusar and Tionne Solusar being badly injured . Background . Co - Chief of State Jacen Solo sent a detachment of Galactic Alliance Guard personnel , led by Major Salle Serpa , to the Jedi Academy on Ossus . The academy at this time was occupied mainly by Apprentices because most Knights were on Coruscant at the Funeral of Mara Jade Skywalker . Because of rising tensions between him and the Jedi Order , Jacen sent the GAG troopers to threaten the Jedi into compliance . Arriving at Ossus . Jaina Solo , Zekk , and Jagged Fel came to Ossus to find Alema Rar , but they barely found any traces of her on the planet . They did find one trace of her though , which led them to land in the Jedi Academy ' s hangar . Jaina and Jag went into the academy while Zekk stayed in the Ossus forest . When the two entered the academy , they found it deserted . Jaina thought that maybe Kam and Tionne Solusar stopped lessons for the day in order to honor Mara , but this wasn ' t the case . They went up to flight control , but what they found surprised them . They found GAG troopers controlling it , led by Major Salle Serpa . Jaina realized that Jacen was holding the academy hostage , but according to Serpa , the GAG troopers were sent to make sure that the Jedi and the Galactic Alliance stay friends . He also assured the two that Alema Rar was not on the planet . Serpa then threatened the young ones in order to convince Jaina to stay so she wouldn ' t be able to tell anyone what was happening . He also made the two surrender their weapons so they wouldn ' t pose a threat against the academy . Zekk stayed hidden in the forest by the academy to give information to Jaina and Jag , and to get information from them . Also , he stayed there in case he needed to surprise the GAG troopers if they actually attacked the Jedi . Staying at the academy . Since Jaina and Jag had to stay at the academy , they had to temporarily call off their hunt for Alema . Jaina lived with some of the youngest students at the academy and she acted as their dorm parent . Jag on the other hand helped out with supervising the teenagers . As long as the academy stayed orderly the children were left to the adults , while Serpa concentrated on planetary security . Things were going well enough that classes started again . One early morning though , Jaina realized that something bad was happening to the academy and its students . The battle . Coma gassing the Jedi . One very early morning , about two weeks after Jaina and Jag arrived at the academy , Serpa was ordered by Jacen to use coma gas to knock out the adult Jedi . The gas caused Jaina to stay in a deep sleep , but soon she heard Ben Skywalker ' s voice and the voices of scared children , which made her wake up . Although she was awake , Jaina ' s eyes wouldn ' t open so she had to rely on the Force . Jaina was able to pull herself together and through the Force she was able to sense a GAG trooper spraying the coma gas into her dormitory room . She used the Force to throw the GAG trooper into the wall outside her door and he went into unconsciousness . She used the Force again to open up her door and fresh air immediately rushed into her room . Once she had fresh oxygen in her lungs , she left her room finding her dormitory empty of all young ones . She looked outside the dormitory door and saw all of the young ones and Padawans being herded to the Central Exercise Pavilion by GAG troopers . Angering the Jedi . Serpa directed the groups of young ones and apprentices in a specific way . He arranged them by alternating groups of taller children with groups of shorter ones , segregating them with GAG troopers . When all of the organizing was done , Serpa selected specific Jedi , having them form a circle around him in the pavilion . He ordered them by gender , species , and height . When Tionne Solusar saw what he was doing , she marched to the pavilion angrily , in order to stop Serpa from doing anything that would harm the young ones . Tionne told him to return the Jedi to their beds and he would be forgiven for his bad timing , but Serpa took this as a threat and shot her leg . At this point , Jaina had had enough of what was happening . Jag was able to get to her dormitory , and he informed her that there were snipers located around the dormitories and that they were waiting for the adult Jedi to come out of their dormitories to shoot them . Jaina decided that they needed to take out the snipers quickly and quietly . The two left the dorm and Jaina found two snipers hiding behind a bush . She was able to distract them , making them look into the opposite direction , so she could approach them from behind . She then was able to snap their necks , killing them . She took one of the rifles , but while she was doing this , another shot was fired at Tionne , and Tionne couldn ' t help but howl in pain . This caused Kam Solusar to start to get angrier and angrier . The conflict escalates . Jaina jumped onto the roof of her building so she could kill the two snipers up there , but she was too late . Jaina heard another shot being fired and Kam Solusar took Serpa ' s bait . He ran out of his dorm , and was shot three times by one of the snipers on the roof . Jaina quickly killed both snipers , dropped over the roof ' s edge , and saw Tionne curled up at Serpa ' s feet , without the lower parts of one of her legs and one of her arms . This , combined with Serpa calling Jaina and Jag cowards for not showing themselves , caused Jaina to start firing at the GAG troopers . She gave the signal to the young ones and they turned on the troopers . The Jedi used the force to confuse and injure the GAG troopers , and the older Padawans were even fighting hand - to - hand combat with the troopers . Jaina knew she had to stop Serpa , so she ran to him in order to capture him . As she ran she saw young ones on the ground with blaster burns . Jaina reached Serpa and told him to surrender , which he did not . Serpa was about to shoot Jaina , but Zekk came out of nowhere , lightsaber in hand , and he severed Serpa ' s arm . Serpa knew he had to surrender and Jaina , Zekk , and Jag captured him and the rest of the GAG troopers , most of whom were appalled by Serpa ' s orders . Aftermath . Zekk and Jag stayed on Ossus to wait for more Jedi Knights while Jaina headed to Kashyyyk . When she got there she told Luke , what had happened . Neither Luke , Jaina or any of the Jedi could believe that Jacen would do something like this . This , combined with Jacen ' s actions of burning the Kashyyyk forests and torturing Ben , led Luke to ask Jedi Master Kyp Durron to devise a plan that would help tracking the fallen Jedi ' s movements . The apprentices would later be moved to a secret base on the Sanctuary Moon of Endor .