The planet of Jabiim was conquered during the Galactic Civil War. This subjugation represented the culmination of a long-lasting conflict on Jabiim between the Galactic Empire and the native Jabiimi insurgents, an event that unfolded in the decades following the conclusion of the Clone Wars.
After the Clone Wars, the Empire seized Jabiim, exploiting it as a mining world until its valuable mineral resources were depleted. During the Imperial occupation, a Jabiimite resistance movement had been actively fighting against the Imperials for approximately 19 years, operating without external assistance from other rebel factions.
Their strategy involved utilizing stolen and outdated Imperial technology, coupled with swift hit-and-run tactics, to challenge the Empire and their Jabiimi collaborators. However, the Galactic Emperor Palpatine refused to withdraw the remaining stormtroopers from the planet. The more fiercely the rebels resisted, the more oppressive the Imperial control became.
Potential assistance materialized in the form of the Rebel Alliance, which aimed to persuade the fiercely independent Jabiimi to align with their galaxy-spanning cause. They dispatched Luke Skywalker and several other Rebel operatives to aid the local insurgents, unaware that Skywalker was stepping into his father's past—or that the "Skywalker" name could be a death warrant from his would-be allies. During the Clone Wars, Anakin Skywalker, as a Padawan serving the Galactic Republic, had 'betrayed' the Jabiimi, an act that the locals had neither forgotten nor forgiven.
Upon their arrival on Jabiim, they were met by an enraged mob and subsequently taken captive by the very people they had been sent to assist. Luke sought to uncover the details of his father's actions from years prior. Simultaneously, Wedge Antilles and Derek Klivian, X-wing pilots and the only potential source of aid, detected an Imperial fleet approaching Jabiim with orders to either eliminate or enslave its population. The presence of Acclamator-class assault ships within the Imperial fleet, vessels notorious for their use as slave transports, signaled to the two Rebel pilots that the Empire's intention was to enslave the Jabiimi people.
On the planet's surface, Luke Skywalker and his former captors united to fend off an Imperial assault force composed of stormtroopers and massive walker transports, including AT-AT and AT-TE walkers.
Luke struggled to concentrate his nascent Jedi abilities, burdened by the knowledge that his father, Anakin Skywalker, was regarded not as a hero but as a traitor by the people of Jabiim. Following the devastating Battle of Jabiim, Anakin had refused to evacuate the Jabiimi loyalists, subjecting them to Separatist control of their home world.
Employing superior technology, the Imperials triumphed in the battle, crushing the rebellion. Furthermore, the Empire negotiated an agreement with a faction of wealthy Jabiimi: in exchange for their personal freedom, they would surrender the remainder of the planet's inhabitants to the Imperials as slaves.
Adding further complexity to the situation, Darth Vader himself was present in orbit above the planet. Haunted by memories of his previous life, he commanded a complete destruction of the planet, eradicating all life on its surface under the pretense that this would deny the Alliance a potential ally.
Amidst the ensuing chaos, the rebel factions succeeded in escaping and eliminating their Jabiimi captors, with the Jabiim rebels seeking refuge in the nearby mines, now their only means of evading the planetary bombardment.
Days later, the last mine-turned-fortress would be captured by an Imperial ground force under the command of Lieutenant Janek Sunber. All surviving individuals were reportedly transported to a waiting slave transport.