Hakka walled villages can be constructed from brick, stone, or rammed earth, with the last being the most common. The external wall is typically 1 metre in thickness and the entire building could be up to three or four stories in height. Often turrets were also built to extend the range of defensive power and to cover otherwise indefensible points. Battlements were also constructed on the top floor for muskets. The gate was the most vulnerable point and it was usually reinforced with stone and covered with iron. A number of smaller gates followed, in case the outer one was breached. With the exception of a few excessively large forts, Hakka houses usually only had one entrance. The round shape of the walls, which became popular in later stages, added to the defensive value of the fortifications and reduced the firepower of artillery against it. A Hakka fort could withstand a protracted siege, since it was well stocked with grains and had an internal source of water. They often also had their own sophisticated sewage systems. (Hakka Walled Village - wikipedia)
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