Do they? Do you honestly think you could tell what kind of army was marching when hundreds of feet, let alone thousands upon thousands, are stamping the ground? I mean, let alone the sheer vanity in asking for Roman marching and then switching it in some lame attempt to justify the request because of chain mail. News flash: the Romans at the start of our time frame didn't really use chain mail, and when the Romans were using chain several other militaries were simultaneously!