When moving onto fortress ramparts or inside towers, simply follow the normal Warhammer rules for movement. Remember that there is room for only one rank of troops on each wall section, so if the rampart is already completely occupied, there will be no room for any extra models. However, a unit may pass another unit during the Movement phase as long as all the troops who are on the wall end the phase in single file. Troops can freely move from a castle tower or a wall section to any adjacent wall section or castle tower if they have enough movement left available to them.