(in a fort or the like)
a gateway permitting the passage of a large number of troops at a time.
The fort is entered through an arched sally port, which is flanked on both sides by bombproofs.
At other times traverses to cover the sally port and magazine and rifle pits to the cover approaches were recommended.
He asked to use the restroom and when the door opened he escaped out the open sally port door.
Secure holding cells for adults and juveniles will be located on the main floor near the sally port.