It was learned from the location that the traitor who had been plaguing the Imperial Navy by relaying vital information to the rebellion was MoffKalast. EmperorPalpatine demanded that the traitor be brought in for questioning. Kalast was found on the planet of Atzerri, where he owned a personal private estate.
The Imperial fleet arrived at Azterri and requested that Kalast surrender himself. Kalast refused and used his own Imperial Star Destroyer as well as an attack force of Rebel Alliance ships and a station to hold off the Imperial fleet. While damage was done to Kalast's ship, he quickly jumped into hyperspace to avoid capture. The Rebel forces were quickly defeated by the Imperial fleet, but the traitor had escaped.