This large scale execution happened after an attempt on Emperor Roan Fel's life by Darth Kruhl. The Pellaeon-class Star Destroyer Dauntless (which falsely surrendered to deliver the Sith and was to serve as his escape craft) was required to land and the personal ordered to exit for "debriefing." The entire crew was then killed by Bastion's stormtroopers.
- The Complete Star Wars Encyclopedia