Battle of Borosk The Battle of Borosk was a major battle fought in 28 ABY during the Yuuzhan Vong War . After the disastrous Imperial rout at the Battle of Bastion , the Imperial Starfleet regrouped at Yaga Minor before it fell back to Borosk . After a hard - fought battle , the Empire forced the Yuuzhan Vong to retreat . Prelude to the Battle . In the aftermath of the disaster at Ebaq 9 , the Yuuzhan Vong launched a campaign of lightning strikes aimed at enemies they had originally bypassed , including the Empire . Using what forces they could spare , the Vong intended not only to remove these foes from the strategic picture before they could become a greater threat , but to harvest slave soldiers to supplement their depleted forces . The attack against the Remnant succeeded spectacularly at Bastion and Muunilinst , from which the the Imperial Navy was forced to retreat . The survivors from the falls of Bastion and Muunilinst regrouped at the Yaga Minor shipyards . Shaken but determined to fight back , they offloaded their wounded and docked with the slipways to make what repairs they could . With the chain of command uncertain , there was a growing danger that the Empire would break apart into the individual sectors controlled by each Moff , as power plays began even as the Vong prepared for their next attack . However , the revival and sudden reappearance of Grand Admiral Gilad Pellaeon , who had been presumed killed at Bastion , firmed up the morale of the fleet and restored the chain of command . Under Pellaeon ' s direct order , Moff Kurlen Flennic organized the Imperial fall back from Yaga Minor to the more heavily fortified planet of Borosk . Informed by their spies of the Imperial withdrawal , the Vong fleet under B ' shith Vorrik followed . However , the help of several Galactic Alliance Jedi allowed the Remnant to be fully prepared for the upcoming showdown . Jacen Solo used YVH - M Mouse Droids to locate and dismantle a network of spies within the Imperial fleet , and personally dispatched several Yuuzhan Vong infiltrators , thereby denying to the enemy a vital source of information on the true status of the fleet and Borosk ' s defenses . The Battle . Pellaeon divided his fleet into four distinct battle groups , designated by their command vessel names and made up of numerous capital ships and support craft . Fleet Group Stalwart led the vanguard , Fleet Group Protector and Group Relentless each guarded one of the flanks , and Fleet Group Right to Rule maintained the rear . Pellaeon ' s strategy was elegantly simple . The fleet would orbit the planet , protected by ample minefields and surface to space turbolaser systems . They would engage the enemy in a defensive battle , forcing the time - constrained Vorrik to either break off the attack or attempt an overwhelming frontal attack against the heavy defenses . When the Yuuzhan Vong arrived in - system , Fleet Group Stalwart sent four TIE Fighter squadrons led by Luke Skywalker in his XJ3 X - wing to attack before the Vong ships could recover from their hyperspace emergence . Caught off guard , the Yuuzhan Vong initially fell into disarray before their yammosk s re - coordinated their forces . The Imperial task forces steadily withdrew into their defensive orbits , settling in for what was expected to be a long wait . The battle took an unexpected twist when a massive Yuuzhan Vong slaveship arrived at the rear of the Vong formation . Saba Sebatyne proposed that they attack the ship , full of captives from the Battle of Bastion , and allow themselves to be captured in order to rescue the prisoners . Pellaeon agreed to the plan and provided the automated Katana fleet dreadnaught " Braxant Bonecrusher " for the mission . Formerly the Braxant Brave , but renamed in honor of Sebatyne ' s plan , it was designed to ' fake ' a death and thereafter look like a harmless drifting wreck . Its mission would be to jump out of hyperspace near the slaveship and attack it , then allow itself to be ' destroyed ' by the Vong . The slaveship then would be expected to harvest any live prisoners from the ship . Should all go to plan , the " Jade Shadow " , concealed within the " Bonecrusher " , would use its tractor beam to recover the liberated prisoners and then the Dreadnaught would jump out . Staffed by Sebatyne , Danni Quee , Mara Jade Skywalker and Solo , the " Bonecrusher " deployed a dozen automated TIE Fighters and engaged the enemy rear before it faked its demise . The slaveship then sucked both Sebatyne and Quee aboard . Eliminating the crew , the two Jedi cut the ship ' s hull open and the prisoners were tractored into the Dreadnaught ' s hangar bay . Once recovery was completed , the " Bonecrusher " jumped out . As the " Bonecrusher " raided the enemy rear , a gravitic amplitude modulator had been brought in from a nearby Imperial system and installed on the Imperial Star Destroyer " Defiant " , calibrated to the specifications of the yammosk jammer technology developed by Jedi in the final days of the New Republic . Accompanied by a swarm of TIE Fighters and blastboat s , the " Defiant " broke orbit and dove into the Yuuzhan Vong fleet . Once it was in range , the jammer was activated . The enemy fleet ' s sudden loss of cohesion enabled the " Defiant ' s " task force to inflict heavy casualties as it pushed toward the yammosk . Aware its defeat was inevitable , the yammosk attempted to divert the attack , but the Imperial forces refused to be distracted . The self - destruction of two of the yammosk ' s sister vessels temporarily stalled the " Defiant ' s " attack , but a TIE Fighter pilot who had recovered quicker than his or her peers landed the shot that killed the yammosk . With the lead yammosk dead , the slaveship lost , the " Defiant " wreaking havoc in the midst of Vorrik ' s fleet as it hunted the back - up yammosk , and the Yuuzhan Vong already far too weak due to their losses to at Ebaq - 9 , Vorrik had no choice but to withdraw in humiliation , having been bested by a critically - injured Grand Admiral still recuperating within a bacta tank on an Imperial frigate . Aftermath . The Remnant ' s ruling Council of Moffs was shaken by both the Vong attack on Imperial Space and the devastation of their capital world . Pellaeon argued forcefully that the Empire needed to go on the offensive against the Vong and help the Galactic Alliance win the war , since if they simply waited for the Vong to return , they would be destroyed . Several of the Moffs , most notably Moff Flennic , were aghast at the idea of allying with the same organization that had defeated the Empire , which at its height would have easily destroyed the Vong . Although the rest of the Council came around to Pellaeon ' s logic relatively quickly , Flennic , unable to control himself , pulled a blaster pistol and pointed it at Pellaeon . Jade Skywalker intervened before Flennic could kill the Grand Admiral , and while Pellaeon promised not to take any retribution against the Moff , he did warn Flennic that if he ever stepped out of line again , Pellaeon would not be so forgiving . Ultimately , this battle marked the second entrance of the Empire into the Yuuzhan Vong War , which culminated with Imperial forces under the Grand Admiral fighting in the final battle at Coruscant .