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In 3 ABY, during the pursuit of the rogue AdmiralHarkov, Grand AdmiralDemetrius Zaarin set forth his plans to overthrow EmperorPalpatine in an attempt to assume control of the Galactic Empire. While the Imperials were preoccupied with putting down Harkov's pro-Rebel Alliance forces, Zaarin mustered his own personal army in preparation for his takeover of the Empire. Utilizing his vast resources and various advanced technologies, Zaarin was in position to overthrow the Emperor in what he expected to be a swift and complete campaign.
Some time later, Admiral Harkov was captured and subsequently executed by Darth Vader on charges of treachery, and the Imperial loyalists had tracked down his surviving fleet to the Ottega system, where they were aligned with a contingent of Rebel forces. Finding themselves outmatched, the Imperials called on Zaarin and his forces to assist in routing Harkov's fleet. This was where Zaarin would launch his coup d'état. Zaarin's forces arrived on the scene as ordered, but instead of helping the Imperials, they attacked the Imperial Star DestroyerGarrett, Vader's flagship. Although the loyalist forces succeeded in driving them off as well as exterminating Harkov's allies for good, the Galactic Empire was weakened, so the Imperial forces loyal to the Emperor raced to Coruscant to put an end to the impending coup.
Zaarin later captured and boarded the Emperor's personal flagship, the Majestic. With Palpatine captured, Zaarin ordered his strike team to deliver the Emperor to him personally on his flagship, Glory. However, he was thwarted when loyal Imperial forces, led by Darth Vader and Vice AdmiralThrawn, arrived and rescued the Emperor. With the failure of the coup, Zaarin and his task force fled to the Outer Rim Territories.
The failure to overthrow Emperor Palpatine was a severe setback for Zaarin's splinter government, but Zaarin himself remained active. Operating from the Glory and those bases which remained in Zaarin's control, his insurrectionist forces launched a campaign of terror and sabotage against the Empire. The first step in Zaarin's plan was to strip the Empire with the advanced technologies of his creation that they still possessed, providing him with the technological advantage. He started his campaign by destroying the TIE/Advanced starfighterDeep Space Manufacturing Facilities of Omar. Although he suffered losses, Zaarin and his forces were ultimately successful in destroying all TIE/Advanced facilities in the Omar system, dealing a major blow to the Empire. Zaarin continued his campaign by assaulting the Imperial space station Research, a facility previously under Zaarin's direct command. By destroying the facility, Zaarin hoped to deny the Empire access to the newly-commissioned TIE/D Defender, which was still being developed. Once again, Zaarin achieved victory over the Empire by destroying Research, but the surviving TIE Defender prototypes were safely transferred to Coruscant prior to the base's destruction.
However, Zaarin was eventually defeated by Thrawn in battle, and killed, ending his rebellion.