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
Merlon
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A merlon is the solid, upright section of a battlement in medieval architecture or fortifications. Merlons are sometimes pierced by narrow, vertical embrasures, or tooth-like slits designed for observ
Embrasure
…or crenelle; sometimes called gunhole in the domain of gunpowder-era architecture) is the opening in a battlement between two raised solid portions (merlons). Alternatively, an embrasure can be a space hollowed out throughout the thickness of a wall by the establishment of a bay. This term designates the…
Merlons of Alcazaba of Almería in Almería, Spain
Ghibelline merlons at Saint-Pierre Castle, Italy
Guelphs merlons in the Castle of Montechino, Italy