A postern is a small, often hidden door or gate in a fortification, castle, or wall. It is usually located at the back or side of the structure, providing a secure and discreet entrance or exit. Posterns are designed to allow for quick access to the outside, enabling defenders to move in and out without being seen by enemies. They can be used for various purposes, such as sneaking out for a surprise attack or for the movement of supplies and personnel. This architectural feature is important for enhancing the overall security and functionality of a fortification, allowing for greater flexibility in defense strategies.

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