Bastion droid unit

During the early stages of the Clone Wars, the Confederacy of Independent Systems sent a large unit of battle droids to the planet Bastion. The unit was deployed on Bastion to protect the Separatists' ore mining operation from Galactic Republic interference. The Republic learned of it's presence on the planet, thus sending Jedi Master Ki-Adi-Mundi and his squad to destroy the droid unit.