Aggressor ( Executor - class ) The Aggressor was an " Executor " - class Star Dreadnought in the service of the Galactic Empire . Commanded by Admiral Roek , the " Aggressor " and a force of five " Imperial " - class Star Destroyers were part of the fleet that patrolled the Inner Rim . Six months after the Battle of Endor in 4 ABY , the " Aggressor " and its escorts were recalled to the Imperial shipyards at Corellia , where they defended the Imperial withdrawal from the system as the New Republic — formerly the Rebel Alliance — began conquering planets in the Core Worlds . By 5 ABY , the " Aggressor " was in the hands of Grand Admiral Josef Grunger , one of the first Imperial warlords and a man loyal only to himself . Grunger bullied Imperial officers into turning over their ships to his command , gathering a sizable armada of Star Destroyers and smaller cruisers . The Grand Admiral led this flotilla from the " Aggressor " and plotted to use his fleet to seize the Imperial capital world of Coruscant , utilizing the Corellian sector as a launch point . However , the sector had already been taken by fellow Grand Admiral Danetta Pitta ; when Grunger ' s forces arrived in the Corellian system , Pitta took command of a Torpedo Sphere siege platform and began decimating his rival ' s fleet . Grunger , faced with the likelihood of defeat , rammed his flagship into the Torpedo Sphere , an act that killed both Grand Admirals and destroyed both vessels . Description . The " Aggressor " was the third " Executor " - class Star Dreadnought manufactured for the Galactic Empire , and the second warship of that class built at Kuat Drive Yards . The " Aggressor " was one of many such capital ships serving the fragmenting Empire in the years following the death of Emperor Palpatine at the Battle of Endor in 4 ABY . The warship served as a flagship and command vessel . History . The third " Executor " - class warship to be manufactured , the " Aggressor " was the flagship of Admiral Roek , a cunning Imperial commander . Assigned an escort of five " Imperial " - class Star Destroyers , the " Aggressor " patrolled the Inner Rim . Approximately six months following the Battle of Endor , the " Aggressor " and its escorts were recalled to guard the Imperial - held shipyards at Corellia . Information on this reassignment , sent from the Imperial capital of Coruscant , was intercepted by the New Republic and utilized in preparations for an eventual New Republic assault on the capital planet . The " Aggressor " defended the Imperial withdrawal from the Corellian system as the New Republic began its conquest of the Core Worlds . Grand Admiral Josef Grunger , having become one of many warlords in the power vacuum resulting from Palpatine ' s death , had his own plans for the " Aggressor " . Using his high rank , he bullied Imperial officers in the Outer Rim Territories into surrendering their vessels to his fleet . Grunger amassed an armada of thirty " Imperial " - class and " Victory " - class Star Destroyers , one hundred " Carrack " - class light cruisers , and sixty " Strike " - class medium cruisers , among other ships . To lead this flotilla , Grunger secured the " Aggressor " and made it his own command ship . Following the same goal as the New Republic , the ambitious Grunger planned to attack Coruscant with his fleet in 5 ABY , using the Corellian sector as a launching point . However , the sector had already been claimed by Grand Admiral Danetta Pitta after bribing the Corellian Diktat . Upon Grunger ' s arrival in the Corellian system , near the planet Tralus , Pitta took control of a Torpedo Sphere siege platform and began to annihilate Grunger ' s armada . Refusing to let Pitta win , Grunger rammed the " Aggressor " into Pitta ' s Torpedo Sphere , an act that destroyed both vessels . Both Grand Admirals , still aboard their flagships , perished in the collision . Commanders and crew . The Super Star Destroyer was originally commanded by Roek , a cunning admiral who used the " Aggressor " as his flagship . The warship was later commandeered by Grand Admiral Josef Grunger , one of the earliest breakaway Imperial warlords following the Battle of Endor . Ambitious and loyal to no one but himself , Grunger took the " Aggressor " as his own command ship , leading a sizable force of Star Destroyers and other vessels from it . The Grand Admiral sought to conquer Imperial Center with his armada , using the Corellian system as a staging point . It was in that system , at the Battle of Tralus , where a losing Grunger took the Super Star Destroyer and rammed it into fellow Grand Admiral Pitta ' s Torpedo Sphere , destroying both combatant commanders and their flagships . Behind the scenes . The " Aggressor " was first cursorily mentioned in the article " " , published in the " Star Wars Adventure Journal 2 " in 1994 . The " Aggressor " was later included in the article " " from " Star Wars Insider 66 " in 2003 , which expanded upon the Super Star Destroyer ' s history and fate . The warship additionally received an entry in 2008 ' s " The Complete Star Wars Encyclopedia " . In 2012 , " The Essential Guide to Warfare " established that the " Aggressor " was an " Executor " - class Star Dreadnought .