The Ninth Army, alternatively referred to as the Brazen Petard Command, functioned as a Sector Army within both the Republic and subsequently the Imperial military. Its primary mission was to safeguard the Relgim Oversector.
In the initial phases of the Clone Wars conflict, the 9th Sector Army participated in considerable combat operations as the Republic forces endeavored to disrupt the Separatist supply routes linking Muunilinst with the Outer Hydian Way.