Troops only move their full Movement rate over unobstructed ground. They will slow down if impeded by broken ground such as bushes or woods. Terrain is divided into four types to simulate this: open, difficult, very difficult and impassable terrain. As each player's gaming table and collection of scenery pieces is going to be very different, players should discuss before the battle begins which terrain features will be difficult, very difficult or impassable during the course of the battle.