Once the stirrup has been invented and horses have been bred large and sturdy enough to take full advantage of this, the lance becomes the cavalryman's best way to combine his own skill and the impetus of his horse when charging.
Impale
An attack to impale an opponent on the point of your weapon. This attack receives a +3 bonus to damage, but if you are successful in inflicting any damage, the weapon is lodged in your enemy and cannot be used until you sped a single shot withdrawing it or until your opponent moves away, dislodging himself. You can dislodge the weapon as a three-shot action if you wish to move at the same time.
You cannot impale when you Throw a weapon.
Mounted Charge
When you brace yourself in your stirrups and Charge with this weapon, you can base the damage of the attack on your mounts Strength instead of your own. Your mount must make at least a normal move in a relatively straight line towards your opponent, and may move up to twice that.