Cavalry

[KG_RangerBooBoo]

Yes, cavalry can charge undisrupted infantry with a great chance of success.  Just be sure to set them as charging first to get the charge bonus and be sure to check the terrain so that you don't cross or enter terrain that will cause the horse to disrupt.  They are also very useful for clearing out enemy skirmishers. 

Skirmishers are there to harass and disrupt enemy formations.  If you are on the defense put them out as a screen to shoot approaching enemy formations and force them to assault them out of the way to get to your infantry formations.  If on the offense put them in front of your advance to again harass and shoot and possibly disrupt the enemies formations.  Skirmishers are also very useful for defending chateau's because it's easier to stack up in them right up to the limit before you lose the chateau bonus.