Someone was asking about the post-Marian "historical" army, I had one here.

Quote Originally Posted by QuintusSertorius View Post
Huge unit scale does a reasonable 1:10 ratio to real life, thus a "full stack" of around 2500 troops is about equivalent to a real army of 25,000. Thus a legion should only be around 4-5000 men, and thus 400-500 soldiers (ie two to three units).

I'm thinking that a legion should basically be thus:
1 x First cohort
1 x Cohor reformata
1 x "Veterans" - either evocati or antesignani

That gives you a legion of around 500-ish men, or 5000 multiplied up in scale. Each legion would merit the addition of a single unit of skirmishers, and perhaps one of cavalry and one artillery for every two legions present. Having a first cohort in each legion adds to survivability quite a bit, and having one of veterans in each adds flexibility.

As an option, perhaps a unit of allied line infantry for every legion as well.

Thus a two-legion army would be thus:
1st Legion
1 unit of First Cohort
1 unit of cohors reformata
1 unit of antesignani

2nd Legion
1 unit of First Cohort
1 unit of cohors reformata
1 unit of cohors evocata

Support
1 unit of Scorpions/arrow throwers

Allies
1 unit of allied javelin-men
1 unit of allied slingers or archers
1 unit of allied cavalry
Optional: 2 units of allied close-order foot

Plus a general and perhaps a legate/tribune for 11 or 12 units as a "full stack" (or up to 14 if you're including some allied infantry). You might just squeeze in a third legion if you were going with one general.