Depends on the horse Furbie, as well as riding skill (probably)
I make most of my infantry kills by riding down a group of infantry, chopping one's head of while at it with my balanced Bastard sword.
Then zoom away, and repeat the process.
Sort of like making hammerheads in AH
Oh, my version is .894. Is there a newer one?
And, - I have only taken castles. I have razed towns and made the folks hate me with a passion, LOL.
How do you take citadels or towns?
As for war, I can probably make war with anyone? I have run out of castles from enemies to take.
BTW, I'm level 30, and have killed 2.500+ troops