How thick are the walls of a keep?

The new stone wall of a shell keep, either circular or polygonal, could be 3-3.5 metres (10-12 ft) thick and 4.5-9 metres (15-30 ft) high. Inside were such buildings as a hall, barracks, chapel, accommodation, and storehouses. An excellent example of a surviving shell keep is at the c. 1150 CE Cardiff Castle, Wales.



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The keep (also known as a donjon) was a tower which was surrounded by a stone wall, often three metres thick. Stone keep castles were also known as square keep castles, since they were often square in shape.

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Since the 16th century, the English word keep has commonly referred to large towers in castles. The word originates from around 1375 to 1376, coming from the Middle English term kype, meaning basket or cask, and was a term applied to the shell keep at Guînes, said to resemble a barrel.

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Windsor Castle has thick stone walls, in some places up to 4 metres thick.

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They were stronger than hourdes and would withstand crossbow quarrels and even stones hurled by stone throwing siege engines.

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Often, these walls sloped away at the base to redirect objects dropped from the top of the castle wall, ricocheting them out at soldiers on the ground. Because they had walls to protect them, castle defenders would sometimes hunker down and try to wait out their attackers.

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Forde-Johnston describes such a site as a castle in which water plays a prominent part in the defences. Apart from hindering attackers, an abundant supply of water was also an advantage during a siege. Topographically, such structures are a type of low-lying castle.

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The entrance to the castle was always its weakest point. Drawbridges could be pulled up, preventing access across moats. Tall gate towers meant that defenders could shoot down in safety at attacks below. The main gate or door to the castle was usually a thick, iron-studded wooden door, that was hard to break through.

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Windsor Castle is the oldest and largest inhabited castle in the world and has been the family home of British kings and queens for almost 1,000 years. It is an official residence of Her Majesty The Queen and is still very much a working royal palace today, home to around 150 people.

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