Bombardment of the Uba system

The Battle of Uba IV was a battle in the the New Sith Wars.

At some point during the conflict, the Old Republic conducted a massive, genocidal purge against the Ubese species, with none believed to have survived. For centuries previous, the Ubese had begun manufacturing weaponry in a bid to become competitive and to spread their influence throughout the Galaxy.

However, among these were weapons banned since the foundation of the Republic. Upon further investigation by local sector observers, the combined worlds launched a preemptive strike in the form of a full-scale planetary bombardment. Unfortunately for the Ubese, the bombardment set off the largest share of their tactical weapons of mass destruction, utterly destroying three out of the four inhabited worlds in the system (Uba I, II, and V), with the only survivors found on Uba IV.

The Old Republic, though, covered up the entire affair &mdash; so ashamed of their actions there. The Republic sector authorities and Jedi refused all relief aid in the aftermath, even going so far as to wipe the very coordinates of the Uba system off the galactic navcharts. The average galactic citizen had never even heard of the Ubese near-genocide. Some of them, however, did escape, and managed to secrete themselves away on various worlds, blaming the Jedi and the Republic for turning their world into a radioactive ball.

These Ubese refugees managed to find employment with various crimelords and other shadowy figures, forging themselves into weapons: well-trained, highly disciplined, and utterly unstoppable in their hatred of the Jedi.

Behind the scenes
The timeframe of the Battle of Uba IV presented in the The New Essential Chronology conflicts with the previous official account given in the game Knights of the Old Republic II: The Sith Lords &mdash; in the game's storyline, a number of the Ubese survivors from the battle had taken up employment with the Quarren Exchange crimelord Visquis on Nar Shaddaa, acting as personal grenadiers within his private sanctuary. The game describes their clan utterly despising the Jedi for their role (or lack thereof) in what occurred... the Republic bombing the Ubese homeworld, and the Jedi refusing to lift a finger to intercede. The information presented in The New Essential Chronology does, however, more closely mesh with the account given in the role-playing game supplement Alien Encounters.

Dan Wallace explains the discrepancy as follows:

 It's been pointed out that the NEC places the destruction of the Ubese homeworld (forcing the Ubese to wear breath masks like Leia in ROTJ) at approx. 2000-1500 BBY -- however, the game Knights of the Old Republic 2: The Sith Lords'', set in 3951 BBY, features breathmasked Ubese. It's a discrepancy for now. (For the record, I placed the event where I did to correspond with WEG's Alien Anthology, and was unaware of KOTOR2's Ubese at the time.) ''