Battle of Atraken
this was the name given to one of the early battles of the Clone Wars, in which the Old Republic battled the forces of the Confederacy of Independent Systems for control of the planet's doonium resources. When the battle for Atraken, codenamed Operation Katabatic by the Army of the Republic, turned toward the Republic, Separatist forces located in underground bunkers unleashed a series of biochemical weapons against the Republic's clone troopers. While the clone troopers were prepared for the chemicals, the general populace of Atraken was not. Operation Katabatic was considered a tactical success for the Old Republic, since the Separatist forces were eventually eliminated. However, it was estimated that ninety percent of Atraken's civilian population was killed during the battle and the subsequent chemical bombardment.