The clash known as the Battle of Byss took place following the conclusion of the Clone Wars, marking the ultimate offensive by the Alderaanian Resistance against the Sarlacc Project's military.
After a group of infiltrators seized control of a space station in orbit, they managed to disable Byss's defensive systems. This action enabled Lady Alya Aldrete's smuggler fleet to penetrate the Super Star Destroyer prototype's reactor core, resulting in its destruction and the elimination of the danger it posed.