General Grievous, the supreme commander of the Separatist droid armies, kept with him silent protectors known as bodyguard droids. The agile warriors carried impenetrable
electrostaffs that scintillated with coursing energy, capable of blocking even a
lightsaber attack. These near-mindless humanoid droids faithfully carried out their attacks for the General, tenaciously engaging their foe regardless of personal damage. A bodyguard droid would continue fighting even if it had its head severed.
When Jedi Knight Anakin Skywalker and Jedi Master Obi-Wan Kenobi led the mission to rescue Chancellor Palpatine from General Grievous, they faced his personal droid bodyguards on an escaping Trade Federation cruiser.