Quote Originally Posted by Titus Marcellus Scato
A full Roman stack of 20 units for me equals a consular army of 2 legions and 2 allied legions.
The same for me, what makes 5 units for a Legion. One Legion alone doesn't really work because you would need some 1/2 units for it: Camillan skirmish infantry, Polybian Triarii and the cavalry. Therefore I always use "double Legions" with 10 units in-game (or 9+FM).