An assault was launched against the Defiance within the Bestine system amidst the backdrop of the Galactic Civil War.
As part of Operation Skyhook, the Empire unexpectedly struck the command ship known as the Defiance in close proximity to Bestine IV, where a significant Rebel installation was situated. The Imperial-class Star Destroyer named Immortal completed its hyperdrive transition right beside the Mon Calamari Star Cruiser Defiance.
Upon its arrival, the Star Destroyer Immortal launched its complement of TIEs. Thanks to the efforts of Red Squadron's X-wings and Blue Squadron's A-wings in eliminating a substantial number of Imperial starfighters, the Defiance was able to make its escape into hyperspace.