Units can vary in size from small cavalry regiments to infantry regiments with several battalions.
The following statement in the rules has me confused though:
How can an Element contain multiple battalions? I looked at Element statistics and couldn't find a battalion parameter. Is it related to the number of men? Perhaps battalions are increments of 250 men or less in an Element. It seems possible that the rules should refer to single Element Units and multiple Element Units, since Units target enemy Units.Battalion-sized infantry and cavalry elements that score a hit during Assault combat generally cause the target element to lose one (1) strength point. Elements containing multiple battalions can cause up to three (3) strength point losses per hit.
Each element that is eligible to fire in a combat round is given an opportunity to score hits (i.e. inflict casualties) by firing on an enemy Unit —each Unit firing directs all its fire against a particular enemy Unit.