What is the difference between a battalion and a regiment?
In modern times, the echelon that falls between Company and Brigade is the Battalion, usually commanded by a Lieutenant Colonel, and Regiments are mostly historic and ceremonial designations. Sometimes Regiment is still used in the name when another unit type would be inappropriate for one reason or another.
A battalion is typically 800 troops, and a regiment may be composed of two of those. A brigade is two or more battalions, which can be combined into a division. A division is an organization composed of around 20,000 troops.
A division is a serious incursion.
Fireteam = 2–4
Squad/Section = 8–14
Platoon/Troop = 15–45
Company/Battery/Squadron = 80–150
Battalion /Cohort = 300–800
Regiment /Brigade /Legion = 1,000–5,500
Division = 10,000–25,000
Corps = 30,000–50,000
Field Army = 100,000–300,000
Army Group /Front = 2+ field armies (600,000+)
Region /Theater = 4+ army groups (1,200,000+)
I was thinking of an earlier comment I made about a smaller amount of invading troops.
The proverbial brown matter hits the spinning blades when the get up to the Theater level ... some where I read that the real number of invaders will approach 600,000,000 ... I think they must have meant only a mere 600,000 ...