A number of Kaminoans, known only as the Clone Masters, resisted the growing rule of the Galactic Empire and formed an armed rebellion against it
The Clone Masters still had vials of Jango Fett's DNA used to grow the clone troopers of the Grand Army of the Republic from the Clone Wars, and grew a new army of clones, which would be known as Anti-troopers. Donning Phase I clone trooper armor, this army comprised Clone jet troopers and Rail-class ARC commandos.
The resistance made an attempt at attacking the Empire. In response, a special detachment of the Imperial 501st Legion stormtroopers were deployed into Tipoca City on Kamino. Darth Vader hired Boba Fett to lead the invasion. Tipoca City was his home city, and he knew the complex very well.
In the ensuing conflict, the new cloning program was shut down, and the Clone Masters were shot out of the sky while fleeing in Low Altitude Assault Transport transports.