[The Artist Formerly Known as Hawk]

No see you should just do what me and my friend do on Medievil I; build entire armies of cavalry, backed up by a reserve army of cavalry and half another reserve army of cavalry. Who needs tactics when you essentially have the entire force of the Rohirrim at your command?

We've had battles where we've had a normal army consisting of all the usual fluff of light and heavy infanrty, archers, etc, which has then been defeated by whoever, and the entire army has routed, only to be replaced by an entire army of cavalry. It then just comes down to an all map select all cavalry hoedown and watching them trounce the offenders. There's no better way to go from an "imminent defeat" to a "victory imminent" status than a massive cavalry charge.