Legion

A legion is a generic term for a type of military unit. The term was originally used to describe an infantry unit in Ancient Rome; the general size of these units fluctuated during the military history of the Roman Empire between approximately 4500 and 5200 soldiers, the equivalent of large regiments or brigades in the UNSC Army and Marine Corps.

Covenant
In the Covenant military, a legion is a division of Sangheili warriors. A legion is usually led by a high ranking officer, such as a Zealot or an Ultra. The responsibilities and purposes of a legion seem to vary. They are capable of performing tasks ranging from bridge-crew on starships to ground combat. The violent nature of the Elite society likely demands that legions should be capable of engaging in varied forms of warfare.

Known legions

 * Dn'end Legion

Warrior crèche
A warrior crèche is likely a type of legion where newer warriors hone their combat skills before being assigned to a regular legion. Warrior crèches seem to be specifically used for ground combat, and are carried aboard Covenant fleets should any ground actions be needed.

Warrior crèches

 * N'Noro Warrior Crèche
 * E'Toro Warrior Crèche
 * R'Lan Warrior Crèche

Forerunner
In translated Forerunner records, the term legion is used in reference to a type of Warrior-Servant organizational unit.

List of appearances

 * Halo: Ghosts of Onyx
 * Halo: Cryptum
 * Halo: Silentium