A gate or passage by which the garrison of a fort may attack besiegers The term is applied to the postern leading under the rampart into the ditch, but its modern application is a cut through the glacis to the covert way When not in use, sally ports are closed by massive gates of timber and iron
A double gate at a sentry station providing access control to a restricted area Both "vehicle" and "man" versions were used Originally used in describing fortifications for castles, towers, etc meaning "a discreet exit which allows the defenders to 'sally forth' and engage the attackers " Click here for more information