Jeff Jonas has an article on using war machines in Warhammer Ancient Battles. There are some nice pictures of painted Roman war machine models, and a good discussion of their use by the legions.
The Warhammer Ancients rules book is full of point values, but it’s sometimes difficult to tell exactly how many of each troop type you should have. If you’re into Romans, here’s an example army list for you.
The Othismos ancients wargaming blog has a Warhammer Ancients scenario for the battle of Sepeia, fought in 494 BC between the Spartans and Argives.
Here’s an article on Late Medieval Bosnian Armies for Warhammer Ancient Battles.