Operation Ringbreaker Operation Ringbreaker was a strike conducted by the Rebel Alliance ' s Sixty - First Mobile Infantry , often known as " Twilight Company , " on several worlds held by the Galactic Empire . The eventual intent of the campaign was to disable the heart of the Empire ' s ship - building operations , the Kuat Drive Yards . Eventually , however , Twilight Company abandoned the campaign in favor of assisting the Sullustan people in the aftermath of the Siege of Inyusu Tor . Prelude . The Sixty - First Mobile Infantry , or Twilight Company , was one of the many battle groups of the Alliance to Restore the Republic . Founded in sometime before the Battle of Scarif , it served with the alliance during the Galactic Civil War . Towards the end of the Mid Rim Retreat , first Sergeant Hazram Namir and his squad extracted the defecting Governor of Haidoral Prime Everi Chalis . She offered to help the alliance with her knowledge on the " Imperial War Machine " . Her knowledge helped them in the Coyerti campaign and when they were being tracked by imperial forces shortly after . She , Captain Micha Evon , Namir and two others were then invited to Echo Base on Hoth by the Alliance High Command . She was at center stage in a strategy conference that went well before the imperials discovered the base . The Battle of Hoth broke out and Captain Evon and the two Twilight Soldiers were killed . Chalis and Namir escaped with her old imperial clearance codes . At the same time , the rest of Twilight Company lost the rest of their officers when their CR90 corvette the " Thunderstrike " was Infiltrated . Stuck on Ankhural . After the loss of their leadership , Twilight Company retreated to Ankhural where they were reunited with Chalis and Namir . They honoured their losses and repaired the " Thunderstrike " . Some soldiers considered quitting fearing the imperials would find and destroy them if they stayed . Chalis however thought of a strategic way to use the four - hundred soldiers they had and proposed Operation Ringbreaker . This was a strategic campaign which would see to the destruction of Kuat Drive Yards if it went as planned . Before Kuat , they would attack a number of imperial installments to distract ships from there and since many ships were chasing the rebellion into the Outer Rim Territories after the clash on Hoth , this would be easy . Namir took command of Twilight Company and the other senior personnel , including the officers of the Braha ' tok - class gunship " Apailana ' s Promise " agreed with the plan . They would soon launch the campaign . The campaign . Intitial attacks . Twilight ' s first target was the warehouse world of Mardona III , they battled through the underground installments and planted mines facing an Unidentified armored worm vehicle at some point which had killed one of their sergeants , Charmer . The battle was a success in the end and they went to their next target Obumubo . The Attack on Obumubo was also successful and they moved onto the Dockyards of Najan - Rovi where they obliterated the under - funded defenses and left what was left with almost a hundred burning imperial luxury transports . The next attack on Nakadia targeted the plastic factories there and had a rough start at first . They won and moved to Naator , Xagobah and then the Kuliquo belt where they sent out twenty soldiers to sabotage many machinery there . Fall at Sullust . Following the successes of the first attacks , Twilight attacked the factory of Inyusu Tor on Sullust near it ' s capital of Pinyumb . They successfully captured the place but as the " Thunderstrike " came to pick them up , it was ambushed and shot down by a swarm of TIE Fighters . The " Apailana ' s Promise " retreated leaving the ground forces stranded . Namir then had two squads go to Pinyumb to meet with the Sullustan resistance but they had too little resources to help . Namir returned to find the Imperial Star Destroyer " Herald " had arrived . Imperial ground forces then advanced and Chalis abandoned Twilight Company during the clash . She took a stolen shuttle up to the " Herald " and set off Ion mine s inside to take out from the battle . The " Apailana ' s Promise " had returned to help and the imperial ground forces were overwhelmed . Once the last of the Imperial forces were dealt with , revolts broke out all over Sullust and Twilight Company had liberated it . Due to their heavy losses , they were forced to abandon Operation Ringbreaker .