The Eighth Army, alternatively referred to as Bright Jewel Command, functioned as a Sector Army within both the Republic and, subsequently, the Imperial military structures. Its primary mission was to safeguard the Bright Jewel Oversector. As a component of the Northern Campaign Sector Armies, which encompassed Systems Armies Delta, Epsilon, and Zeta, the 8th Sector Army concentrated its efforts during the Clone Wars on the Separatist planets of Mygeeto and Muunilinst. Due to the nature of its operational theaters, the 8th Sector Army experienced some of the most intense combat encountered by any of the Sector Armies, requiring frequent reinforcements from various reserve commands.