I've mentioned earlier I think that the BoA engine would work well for a Roman era game. Since the team seems to prefer games that have a French tie-in, I thought I would do a quick pitch for Caesar's Gallic campaign as a game idea.
Caesar's campaign in Gaul is very similar in fact to the American Revolution. The Gauls play the role of the American rebels, and Caesar's Roman legions are the British armies, trying to occupy and pacify a hostile countryside. The campaign spans several years, and includes all the same elements that BoA has, including infantry, cavalry, siege equipment, forts, leaders, allied units (friendly Gauls for the Romans), Roman navies, et cetera.
Think about it team. Get in touch with Vercingetorix and your classical French ancestors!