History

Motte and Bailey castles                                          Castles built by Edward I

Earth Mound (Motte)                                      Circular towers at key points in walls

Wooden wall with no towers                           Stone Gatehouse (strongest part of                                                                           the castle

Wooden central tower / keep                        No central tower / keep

(strongest part of the castle)                        Stone walls

defended outer section ( bailey)                  Killing  ground a small area between                                                                         walls where attackers would be trapped