How do you use cavalry?

[Prussian to the Iron]

only if the player doensn't pay attention - cavalry that gets bogged down will get slaughtered by the greater infantry numbers, larger target they present and (if playing on harder difficulties) the stat bonuses the AI gets... however, if you micro-manage your cavalry, they can still destroy armies

trust me; ive tried using the time-tested chrge-retreat-charge technique. no go.