Postern
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A postern is a secondary door or gate in a fortification such as a city wall or castle curtain wall. Posterns were often placed in concealed locations, allowing inconspicuous entrance and exit. In the
Postern doubling as a sallyport in the flank of a bastion at Dömitz Fortress in Germany
North Street Postern Tower (aka Barker Tower), York
Postern in the rampart of Provins, Seine-et-Marne, France
Sortie
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A sortie is a deployment or dispatch of one military unit, be it an aircraft, ship, or troops, from a strongpoint. The term originated in siege warfare.
Postern
…concealed locations, allowing inconspicuous entrance and exit. In the event of a siege, a postern could act as a sally port, allowing defenders to make a sortie on the besiegers. Placed in a less exposed, less visible location, they were usually relatively small, and therefore easily defensible. Posterns were…
A Venetian sortie during the Siege of Candia (1668)
Gari Melchers War Highsmith