Haha well what I posted is in super-duper-alpha - really more a proof of concept of what Sym was saying than anything else. Like, showing that you can easily model the corps-level fighting forces of WW1-era France. Divisions would require 2-4 times as many subordinate units; regiments 2x that in turn; etc.
So, uh, basically what's going on there is it keeps the number of small guns, machine guns, big guns, as a proportion of the total fighting strength (represented by manpower), and also includes support personnel and cavalry. Then Morale is generally on a real number scale (starting at 0.9 just because), and I have extra stats - organization, mobility, tactics - that represent the skills of the generals.