Sally port
Secure, controlled entryway to a fortification or prison / From Wikipedia, the free encyclopedia
A sallyport is a secure, controlled entry way to an enclosure, e.g., a fortification or prison. The entrance is usually protected by some means, such as a fixed wall on the outside, parallel to the door, which must be circumvented to enter and prevents direct enemy fire from a distance. It may include two sets of doors that can be barred independently to further delay enemy penetration.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/16/Medieval_sally-port_on_north_enceinte%2C_Citadel%2C_Victoria%2C_Gozo.jpg/640px-Medieval_sally-port_on_north_enceinte%2C_Citadel%2C_Victoria%2C_Gozo.jpg)
From around 1600 to 1900, a sallyport was a sort of dock where boats picked up or dropped off ship crews from vessels anchored offshore. That meaning occasionally still occurs, especially in coastal Great Britain.