A unit may move from the courtyard to the ramparts or onto a tower during its Movement phase if it can move into base contact with the wall or tower.

Models in the unit are placed anywhere within the tower or along the rampart that the player wishes. If there is insufficient room to move all the models in the unit onto the rampart or tower, the rest of them are left in the courtyard in base contact with the tower or wall, and are still considered to be part of their unit. They must be moved onto the rampart or tower as soon as there is sufficient room.

No large creatures, such as Trolls or Ogres, may enter a tower, though they may move onto the rampart. Cavalry cannot move onto a tower or rampart for obvious reasons!