While there are armies listed for he scenarios in the rulebook, and also in the scenario book, there are not army composition lists. There is an explanation of how the number of bases of each troop type was determined (such as, each base represents 750 infantry or 500 cavalry… or whatever the ratio used was).
What you find though, is that via the balanced point system and the nature of decent sized battles, it is hard to "cheat up" an army. I mean, I could field an army of all elephants, but I would probably lose just about every battle. In our club even for pick up (ahistorical) games, we all tend to field a reasonably realistic army for games.
In my opinion, and as another example, light cavalry are particularly useful, but they won't break good formed infantry on their own. So you find yourself looking to field balanced armies…. my Carthaginians have more cav than my Roman opponents, but then they have more (and better) infantry…. so it all works out, ha ha.
Chal