Clone Wars

From the introduction: The Clone Wars (22-19 BBY), occasionally referred to as the Clone War or the Separatist War, was the name given to the three-year war between the Galactic Republic and the Confederacy of Independent Systems. The war is named after the clone troopers, used by the Republic against the Confederacy's battle droids. The Grand Army of the Republic an the Separatist Droid Army were the two of the largest in galactic history, and fighting between them rapidly spread throughout the galaxy.