Clone Wiki
Eighteenth Army

Other names:

18th Sector Army
Night Hammer Command
Greater Seswenna's Sector Army


Grand Moff Wilhuff Tarkin


Clone troopers

Notable battles:

Greater Seswenna


Clone Wars

This is a Class 3 article.

Eighteenth Army, also known as the 18th Sector Army, Night Hammer Command, and Greater Seswenna's Sector Army, was a unit that served in the Grand Army of the Republic during the Clone Wars. The army was created in 22 BBY and was eventually placed under the command of Grand Moff Wilhuff Tarkin by the time of the Republic's deconstruction and the creation of the Empire.


The 18th Sector Army was one of 20 sector armies deployed throughout the course of the Clone Wars within the Grand Army of the Republic. The 18th was specifically stationed at the command position of the planet Eriadu. The sector army consisted of 150,000 clone infantry units initially but grew even more exponentially as more units were commissioned for the war effort. The 18th Sector Army was under the command of a Governor-General, as well as a Jedi General. The sector army was deployed around the region of Seswenna during the war.[1]

The Moff in charge of the 18th, was Wilhuff Tarkin, who had previously served in the Republic Navy as a Captain,[2] and a native of Eriadu, where the sector army was stationed.[1] Tarkin would add additional forces into the 18th, including non-clone soldiers of the Outland Regions Security Force, in order to better defend the perimeter and his homeworld. The 18th and the ORSF were quickly praised as heroes by the Republic media in their offensive against the Separatists, specifically on Hydian and Rimma.[1]

In 19 BBY, by the time the Republic was disbanded and the Empire was established, the Jedi had been previously stripped of their rank and a majority were executed under Clone Protocol 66, which saw all Jedi labeled as traitors.[3] Following the conclusion of the war, the twenty sector armies coalesced into the Empire. Under Palpatine's command, Tarkin was promoted to Grand Moff and the 18th he kept as more of a personal army for his region. During the Empire's reign, the 18th Sector Army's forces increased approximately 1,572,864 troopers. However, a majority of these were non-clones, as clone troopers had primarily been retired from the Empire and were treated as a minority.[4]

Armor and Equipment[]

The Eighteenth Army fought throughout the entire Clone Wars, possessing Phase I clone trooper armor and Phase II clone trooper armor. By the Empire's creation, they would wear Stormtrooper armor. The unit possessed an assortment of weapons which they utilized to their advantage.


  • The Essential Guide to Warfare
  • The Essential Atlas


  1. 1.0 1.1 1.2 The Essential Guide to Warfare
  2. CW Star Wars: The Clone Wars – "The Citadel"
  3. Star Wars: Episode III: Revenge of the Sith
  4. Rebels Star Wars: Rebels – "The Lost Commanders"