The rules are aimed at "Heroic Warfare" so a really good fit for many dark age armies and the bronze age in the mediteranian. They have the ability to add magic and so can also be used for Fantasy armies, the idea of "reputation" and single combat are central so any culture that has these will probably fit.
James has played Dark Age Britain, EL Cid and mythic Irish and is also working on a Trojan era force, North European Bronze age is just the period I have armies for that are in search of good rules.