Unidentified B1 battle droid (Grievous's castle)

"They're right behind you!"

- The droid speaking with Nute Gunray.

A B1 battle droid served under command of a battle droid lieutenant at General Grievous's castle on the third moon of Vassek in 21 BBY during the time of the Clone Wars.

Biography
When viceroy Nute Gunray escaped the Venator-class Star Destroyer Tranquility, this droid along with a squad of battle droids was assigned to protect a hologram of Gunray, which was intended to throw the pursuers off track. When Jedi Master Kit Fisto along with Jedi knight Nadhar Vebb and a squad of clone troopers reached the Third moon of Vassek and entered into a mysterious castle, they discovered what seemed to be the viceroy, guarded by a group of battle droids, including this one. Eventually, the droids noticed the task force while conversing with the viceroy and engaged them, only to be destroyed by the clones moments later.