The Heurkea operation, a significant event, unfolded on the planet Dac during the tumultuous times of the Galactic Civil War. In the year 1 BBY, a compact Rebel team, composed of former Senator Bail Organa, Captain Juno Eclipse, and the holodroid known as PROXY, executed an infiltration mission on the Imperial-occupied world of Dac. Their primary goal was to integrate the strength and resources of the Mon Calamari Resistance into the Rebel Alliance, which was in dire need of increased manpower and advanced starships to effectively challenge the Galactic Empire's dominance over the galaxy.
Beyond simply recruiting the Mon Calamari, and even the Quarren species, Organa and his team journeyed to Dac with the purpose of persuading Captain Gial Ackbar, an escaped slave and the leader of the Resistance, to enlist in the Alliance Fleet as a commissioned officer. Grand Moff Wilhuff Tarkin, a close advisor to the Galactic Emperor Palpatine and Ackbar's master, was the official overseeing the occupation of Dac.
Shortly after the failed mission that occurred on Cato Neimoidia, Captain Juno Eclipse gave a report to the Alliance leaders, which consisted of ex-senators Mon Mothma and Garm Bel Iblis, in addition to Senator Leia Organa, who was present to represent the interests of her adoptive father in his absence. The presumed death of Jedi General Rahm Kota was viewed as a disappointing setback. Mothma, anxious and excessively cautious, became even more resistant to her colleagues' aspiration to openly fight the Galactic Empire. With the war starting off poorly, she wanted to conserve the limited resources the Alliance had.
Juno Eclipse had become tired of Mothma's unchanging stance, just as Rahm Kota had been before his disappearance on Cato Neimoidia. Eclipse, under the belief that the Alliance would never be taken seriously by the Empire if it continued to follow the former senator's slow and ineffective way of war, attempted to persuade the Alliance leaders that a powerful display of rebellion would force Emperor Palpatine to take the Alliance more seriously. Simultaneously, she also insisted on the necessity of replacing Kota with a new military leader who could inspire the soldiers to support the Alliance's cause. Both of these goals could be achieved with a single action on the planet Dac by recruiting the Mon Calamari Resistance and their leader, Captain Gial Ackbar. Although Ackbar pledged his support to the Alliance after being liberated from slavery, it was a weak display of allegiance without the support of his world or its valuable military resources.
However, because Dac was under heavy Imperial occupation, Mothma rejected Eclipse's plan as being too dangerous for the young Alliance to support. However, Garm Bel Iblis approved and wanted to cast his vote in favor of a mission to Dac. Due to his absence from the meeting, Bail Organa's vote defaulted to his adopted daughter, Princess Leia Organa, who refused to act until consulting with her father. Eclipse could only watch with anger and frustration as she saw firsthand how the Alliance leadership was deadlocked in division and indecision. As Mothma explained how another catastrophic setback would leave the Alliance in a more disadvantaged position and further discourage the Mon Calamari from fully committing to the Rebellion, Eclipse began to understand how Kota could hold the Alliance leaders in such high contempt.
When she threatened to resign her commission as captain of the Rebel flagship Salvation and leave the Alliance permanently, Commodore Yat-De Viedas threatened her with the possibility of a court-martial for working alongside General Kota without the approval of Alliance High Command. Exhausted and feeling defeated, Eclipse accepted the situation and awaited their decision. In the meantime, she was temporarily suspended from active duty.
When the meeting came to an end, Juno Eclipse decided to take things into her own hands by pursuing her goal to strengthen the Rebellion, regardless of whether the Alliance leaders approved of her actions. However, she was initially unsure about how to proceed, given the fact that she was not a Force-wielding assassin who operated outside of the organizational hierarchy as Galen Marek had been. In stark contrast to Darth Vader's late apprentice, Eclipse thrived on knowing her place and performing all duties to the letter; "thinking outside of the box" was not her expertise. Thus, she welcomed the discreet assistance of Bail Organa, who had followed her to Dac's moon. Along with PROXY, Marek's old holodroid, Organa and Eclipse managed to arrive on Dac without alerting the Imperial garrison.
Upon their arrival, the trio were greeted by Captain Ackbar. The Resistance leader agreed to Eclipse's proposal, but only if they first helped him in a plan to free the Mon Calamari and Quarren from the Empire's control. Thus, they created a plan to weaken the Imperial infrastructure that was keeping Dac suppressed. In order to improve the odds of a successful mission, Ackbar introduced Seggor Tels and five Quarren saboteurs. Though originally a collaborator with the Galactic Empire, Tels assured the Rebels that the enslavement and mass murder of Dac's native population caused him to take up arms against the Empire by joining with the Mon Calamari Resistance.
The mission focused on infiltrating the city of Heurkea, which was guarded by the TIE fighters of the 181st Imperial Fighter Wing. With the exception of full-wing debriefings, which took place once every five days, the pilots of the 181st flew constant patrols with at least two TIEs in the air at all times. Hence, the Rebel group sought to make an example of Heurkea by disrupting the Imperial operation in the city. By doing so, they would also succeed in damaging the prestige of the Empire, thus garnering a symbolic victory that would galvanize the peoples of Dac to launch full-scale insurrection.
After stealthily entering Heurkea and killing several stormtroopers along the way, the group captured Evir Derricote, the commanding officer of the 181st. PROXY, utilizing his built-in holographic technology to impersonate Derricote, distracted the 181st pilots during a full-unit debriefing and then issued orders that would keep them occupied while the Rebels proceeded with their objective to assassinate Grand Moff Wilhuff Tarkin. As one of the Empire's most visible public figures, as well as the founder of the Imperial doctrine, Tarkin was regarded as a high-profile target for assassination by the enemies of the Empire. At the same time, the Quarren saboteurs discreetly planted explosives throughout the city.
When Tarkin and his stormtroopers surrounded the Rebels, the mission initially appeared to be compromised. The Grand Moff gloated about how Tels had betrayed the Mon Calamari by collaborating with the Empire once again. He also made comments about his intention to reclaim his slave, Ackbar, whom he had grown fond of.
He failed, however, to realize that it was a ploy to draw him out into the open, thereby exposing himself to his would-be assassins. As the 181st TIE fighter flew over the city, the explosives were intentionally detonated to make it appear as though the 181st was attacking the Imperial-occupied city of Heurkea. The Imperials were easily fooled into believing that their own pilots were attacking them, and thus attempted to retreat to safety. In the ensuing chaos, the Rebels killed many stormtroopers, but Tarkin managed to escape with his life.
Even though they failed to assassinate Grand Moff Tarkin, the Rebels considered their mission to be a success. The Galactic Empire's reputation had been damaged and the Imperials had been made fools of—all due to the efforts of a small team of Rebels and Dac resistance fighters. With their primary objectives achieved, minus the death of Tarkin, the Rebels released Derricote so that he could provide a report of the Rebel activity on Dac to his superiors, thus spreading the word throughout the Empire's chain-of-command about the Rebellion's determination to win at all costs.
By humiliating the Empire, Juno Eclipse knew that many other beings would be inspired to take up arms against Palpatine's oppressive regime. She also knew that their actions would motivate the peoples of Dac to continue resisting the Empire until their world was freed from Imperial control. As she and her companions prepared to depart from Dac, Captain Ackbar conveyed his gratitude to the Rebels by assuring them that the Mon Calamari Resistance was ready to join with the Alliance to Restore the Republic in their common goal to overthrow the Galactic Empire. The humiliation of Imperial forces during the Heurkea operation would finally led the Mon Calamari to revolt against their oppressor and liberate their world.
When Eclipse reported the events at Heurkea to the Alliance leaders, Mon Mothma was furious with the Rebel officer's lack of compliance to the Alliance's chain-of-command. She even regarded Bail and Leia Organa with suspicion, believing that the two assisted Eclipse behind her back. Despite the fact that the success on Dac achieved more for the Alliance than Mothma's overcautious approach to warfare, Mothma stood by her beliefs that all-out war against the Empire was a futile and reckless strategy. In her eyes, the Alliance would have lost Organa and Eclipse, as well as any hope of recruiting the world of Dac, if the mission had ended in failure. Garm Bel Iblis, discontented with Mothma's constant complaining, denounced his fellow ex-senator and scolded her for standing in the way of an entire organization that wanted to fight the Empire. By going against the will of the people, Bel Iblis compared Mothma's leadership to a tyranny, not so far removed from the one they were trying to fight—if Mon Mothma would just stand aside instead of always standing in the way. Mon Mothma, opposed by her own colleagues and the vast majority of the Rebel Alliance, accepted her personal defeat and realized that she could no longer enforce her own style of leadership over the Rebellion and its followers. Due to the example of Dac, the rest of the Rebel leaders began to seriously consider Eclipse's views on how the Alliance should conduct its operations against the Empire. Regarding her views, Eclipse preferred Rahm Kota's aggressive tactics to Mothma's complacency, but without Kota's recklessness. She advocated decisive and smart actions, making a difference through achieving well-planned victories on a major scale, or at the very least—symbolic ones as well.