Let's update to a triangular system
|Unit||Sub-unit||Roman Equivalent||Unit Commander Old||Personnel Old||Unit Commander New||Personnel New|
|Battalion||Wing||Order (Before Cohort exists) or Cohort||Lieutenant Colonel||512+||Lieutenant Colonel||19683+|
|Wing||Grand Division||Major or 1st Captain||256+||Major||6561+|
|Grand Division (Double Company)||Company||Maniple (From Samnites)||2nd or 3rd Captain||128+||Captain||2187+|
|Company (Division) (Battery) (Squadron)||Platoon||Centuria||4th to 7th Captain||64+||First Lieutenant||729+|
|Platoon (Subdivision) (Troop)||Section||Lieutenant||32+||Second Lieutenant||243+|
|Team||Buddy||Private First Class||4+||Private Fist Class||9+|
|Buddy (Cell)||Personnel||Private Second Class||2||Private Second Class||3|
|Main Line Infantry||Riflemen|
|Flank||Light or Heavy|
|Light||Sharpshooter or Ranger|
|Heavy||Grenadier or Mortar-men|
Order: A unit composed of a Maniples of Each of the following: Triarii (Third Line), Principes (Primary Line), Hastati (Spear-man, name comes from Hasta (spear)), Velites (Javelin-man), Sagitarii (Archers), and Funditori (Slingers). It also contains a unit of Fabrorum (Fabricator / Siege Engineers).
An older Legion consists of 15 orders.
Warning: Grand Division has several different meanings, and one of those definition refer to a temporary unit of several corps during the America Civil War. Another definition here...
It also extend to Division which means a company during the middle ages to several brigades later on.
Division = Company, at the same time as, Grand Division = Double Company.
Civil War Old Definitions:
Grand Division - A unit compose of several Corps. Later renamed to Army.
Military Division - A unit compose of several Grand Division. It is equivalent to Army Group, Army Region, or Army Theater.