Virgil, care to comment on this ? I see many similarities between modern armies and Roman Legions, but don't know whether it's co-incidental as Caldrail suggests, or whether things like rank structures, logistics, military discipline and the like can be traced to a somewhat Roman origin.
One thing though - I would have thought Napoleans organisation excellent, and the British armed forces both land an Naval during the empire anything but disorganised. I'd imagine, although I have never studied it, that forces engaged against the British in the American Civil war were also well organised.