In the Roman arena it was common to represent a historical or mythical battle, but these were often done with little knowledge of or interest in the proper costumes. Think about the historical films of the last few decades which are often inaccurate in terms of the uniforms or even the facts. There was at least one occasion on which "Amazons" fought in the arena. Maybe they looked something like the new Red Box figures? That's enough of an excuse for me to buy them, anyway! I have enough gladiators to oppose them, or possibly use Alexander's phalangists.