Thranconia

CHARGE: during a movement phase, a combatant can declare a Charge. He must move at least 15’ and end in contact with an enemy. A combatant may not charge two turns in a row. If he charges he will gain +1 to his “to hit” roll and +1 on his “damage” roll, on the next melee phase, except if he is using a lance from a medium or heavy horse in which cases he will still get the +1 to hit, but will roll double weapon dice. If a charging combatant is hit in melee by an opponent using a Spear, Dismounted Lance or Pike on the round his charge bonus would be gained, the opponent will double his rolled weapon damage.

You do not gain any benefit from a charge uphill or upslope. You gain an additional +1 damage and an additional 5' of movement if you charge down a significant slope or hill.