The Thirteenth Army, alternatively referred to as Iron Lance Command, was a Sector Army of the Republic, and subsequently the Imperial military, tasked with safeguarding the Trans-Nebular Oversector.
Throughout the Clone Wars, the 13th Sector Army was assigned a vast operational area, largely because its duties encompassed the central territories controlled by the Hutts. These core territories had a limited presence of Republic troops, with the exception of the base located on Toydaria. The 13th Sector Army played a crucial role in the defense of Kamino, fending off numerous assaults by the Separatists. Furthermore, it maintained a defensive position against the Separatist's effort to isolate the Republic's Rimward forces at Christophsis. It received consistent support from both the 4th Sector Army and the 14th Sector Army.