Embrasure
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An embrasure is the opening in a battlement between two raised solid portions. Alternatively, an embrasure can be a space hollowed out throughout the thickness of a wall by the establishment of a bay.
Embrasure with three angles of fire, Keoti Fort, India
A loophole or inverted keyhole embrasure, allowing both arrow fire (through the arrowslit at the top) and small cannon fire through the circular openings, Fort-la-Latte, France
Embrasure of Chinese wall
Embrasures at Mdina, Malta
Loophole (firearm)
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A loophole is a protected small opening, which allows a firearm to be aimed and discharged, while providing cover and concealment for the rifleman. To prevent detection, the rifle's muzzle should not
Arrowslit
German rifleman shooting through a loophole