I decided to create this mod just for fun! It adds a bunch of different greek units and roman units to the game.
Cretan archers, athenian hoplites, spartan hoplites, athenian veterans, theban sacred band, roman legionaires, varangian guard, epirote pikemen, athenian pikemen and karian axemen for Eastern Roman Empire, Roman Expedition and Byzantine Empire. Roman Legionaires for western Roman empire. PUT THESE FILES ON YOUR ATTILA DATA FOLDER.