Subjugation of Mon Calamari

Following the dissolution of the Galactic Republic, the newly formed Galactic Empire began to spread its power across the galaxy. As the Imperial war machine began to grow, new resources were needed. Slavery was a key component to this buildup. Like the Wookiees of Kashyyyk, the native Mon Calamari and Quarren of Mon Calamari were viewed as ideal slaves. The world's massive shipyards and location near the Tion Cluster made it the perfect site for an Imperial base.

The Mon Calamari attempted to negotiate a peaceful settlement with the Empire, but it was rejected. The world was to bear the full force of an Imperial invasion, led by Moff Wilhuff Tarkin.

Protected by a planetary energy shield, the Mon Calamari and Quarren believed that they could resist any Imperial attacks. However, several disgruntled Quarren sabotaged the planetary shields, opening the world to invasion. They were led by Seggor Tels, a Quarren leader motivated by hatred of the Mon Calamari. The world fell quickly, with the Mon Calamari Orbital Shipyards falling into Imperial possession.

The Empire would go on to control Mon Calamari for nearly two decades, though the Mon Calamari and Quarren slowly planted the seeds of resistance. Experiments with building Imperial warships using Mon Calamari building techniques were dismal failures, while the spirit of Mon Calamari's peoples proved more powerful than the Empire expected.

Before joining the Rebel Alliance, Admiral Ackbar was a slave of Tarkin for many years during the Imperial occupation of Mon Calamari.

When The Star Wars Sourcebook was first published, this battle was presented as the first contact between the people of Mon Calamari and the rest of the galaxy. With the presence of Mon Calamari and Quarren in the prequel trilogy and various Expanded Universe stories set before the rise of the Empire, however, this detail has been retconned away.