When the Clone Wars broke out in 22 BBY, General Grievous was placed in charge of the Separatist droid army. He led this army in many important battles throughout the war. He also developed a ...

when the Trade Federation's droid army was shut down after their command ship was destroyed by Anakin Skywalker. After the Separatists' leadership collapsed at the end of the Clone Wars ...

Another speculates, “Storm the stage, rescue the prisoners, seize the separatist leadership ... weren’t aware of the sheer numbers the droid army had. Thats why the clone army that was ...