Well we should all know by now that any unit under the control of the "AI" in this game is as good as dead.

Not really worth taking the time to brag about beating AI armies....but anyone who has played the Huns can tell you that a horde in the hands of a human player is unstoppable. Imagine the whole of Western Europe (i.e the nice juicy parts with all the cash) turned rebel-colour and 200,000+ Denarii in your treasury by 400AD. That goes for any hordable faction really.

The AI just doesn't really know what to do with a horde.