The Umbaran militia was the local defense force of Umbara, a shadowy world in the Ghost Nebula. The militia was comprised of the planet's native Umbaran people, who utilized the advanced technology that had been developed on their world to defend their holdings and attack enemy forces. Aside from the soldiers who served as infantry units, the militia also made use of millicreep assassin droids, heavy Umbaran hover tanks, multi-legged assault tanks, and massive and mobile heavy cannons. The Umbarans also employed air defense vehicles, including their technologically-unique starfighters and combat support ships. During the Clone Wars, the Umbaran militia fought against the Galactic Republic in support of their world's succession to the Confederacy of Independent Systems.