- Chaete leads a cohort of acha usually around 600 strong, and has two seconds.
- The Chaetid is the second highest ranking member of the cohort and leads a Chaett.
- The Chaetie is the third highest of the cohort and leads a Chaett.
- The Cha'id and Cha'ie of these each lead an En.
- Each En has five An.
- Each An is composed of thirty men.