The Separatist Droid Army, otherwise referred to as the CIS droid army, Separatist Army, or the droid army, served as the ground forces for the Confederacy of Independent Systems‘ military during the course of the Clone Wars. Primarily constructed by the workers of Baktoid Combat Automata, the droid army was led by Kaleesh cyborg General Grievous, who held the title of Supreme Martial Commander of the Separatist Droid Armies, while also being commanded by Separatist leader Count Dooku. According to Dooku, in 22 BBY, the Separatist Droid Army outnumbered the Grand Army of the Galactic Republic one hundred to one. In addition, the droid army continously received additional reinforcements throughout the war, such as in 21 BBY, when they requested a supplemental amount of three million battle droids with financial assistance from the InterGalactic Banking Clan.

For three years, the Separatist Droid Army, with transportation from the Confederacy of Independent Systems Navy, engaged in open warfare with the Grand Army of the Republic on many fronts throughout the galaxy, first coming face-to-face on the planet Geonosis. However, by the third year of the war, the Confederacy and its droid armies had suffered extensive losses to the Republic in the Outer Rim Sieges, and was later deactivated in totality at the immediate end of the war following the deaths of the Confederacy’s leadership. Despite the Separatist Droid Army’s deactivation and the rise of the Galactic Empire under the command of Galactic Emperor Sheev Palpatine, who had orchestrated the war, elements of the droid army remained active several years after the end of the Clone Wars, although these small groups of Separatist holdouts, which were primarily formed from still-active battle droids, were hunted by the Empire following its rise.