his type of castle usually had one entrance defended by gatehouse. As the gatehouse was the only way to enter the castle, it would have been focused upon during an attack. During the construction of a castle the gatehouse was usually the first part to be completed. This was because the castle builders were probably building in an area where they were in danger of being attacked. In earlier times the gatehouse may have been the strongest part of the castle, but the majority of them were built of wood and at risk from fire. If the owner of the castle was rich enough or there was a local supply of rocks, the gatehouse could have been built of stone.

Most castles of this type had only one entrance and the defenders could easily find themselves trapped if the single gatehouse was captured by attackers. To overcome this problem some castles were built with more than one entrance. Most castles had a small hidden gate called a postern. The postern allowed a single defender the means to escape and raise the alarm if the castle was under attack, or allow a small band of soldiers to leave the castle and mount a surprise attack.

he mound on which the keep was built is known as a motte and was usually placed to one side of the bailey. Why the designers decided to build mottes is not known, but a keep on top of a mound was a safer place to be in case of an attack.

If an existing mound was not available it appears that the castle builders went to the trouble of building their own. If the motte was strong enough the wooden keep could have been replaced by a stone building. A stone keep offered much better protection from attack than a wooden keep that could easily be burnt down.

Usually the motte was cut off from the the bailey by its own ditch and could only be reached via a causeway or bridge. The bridge would have been designed to be defendable against attack and possibly retractable using a drawbridge. At times of attack the motte and keep were the last line of defence if the attackers managed to get into the bailey. The defenders could shoot arrows or throw rocks down at the attackers.

Some early castles had more than one motte. The castles at Lewes and Lincoln both have two mottes.