Battery McClellan was to breach the southeast face, and the adjacent embrasure.
From the en.wikipedia.org
Looking out from a gun embrasure on Fort Sumter, I can see those same steeples and rooftops today.
From the sltrib.com
I crawl over to it and look into a gun embrasure.
From the guardian.co.uk
The King moved to the embrasure of a window, motioning to Father to follow him, they remained in conversation for a quarter of an hour.
From the en.wikipedia.org
The carriage was essentially a front-pintle design, with the pintle fixed in the masonry in front of the chassis and below the guns embrasure.
From the en.wikipedia.org
State Counselor Grade Two Innokenty Volodin surveyed all this unseeingly, lolling against the edge of the embrasure and whistling something long drawn out and elusive.
From the online.wsj.com
At 9 a.m. the concentrated fire of the three battleships put the second casemate out of action, when a shell from Nevada pierced the embrasure, killing the entire crew.
From the en.wikipedia.org
Their mission was to fire on the barbette guns until silenced, then switch to percussion shells onto the southeast walls and adjacent embrasure, at a rate of 10-12 rounds an hour.
From the en.wikipedia.org
More examples
Port: an opening (in a wall or ship or armored vehicle) for firing through
In military architecture, an embrasure is the opening in a crenellation or battlement between the two raised solid portions or merlons, sometimes called a crenel or crenelle. In domestic architecture this refers to the outward splay of a window or arrow slit on the inside.
In dentistry, an embrasure is the space that extends from the proximal contact area. If it extends buccally or labially, it is called a buccal or labial embrasure. If it extends lingually, it is called a lingual embrasure. ...
Any of the indentations between the merlons of a battlement; The slanting indentation in a wall for a door or window, such that the space is larger on the inside than the outside
(EMBRASURES) A small opening in a wall through which weapons may be fired. Windows and arrow or rifle loops are usually wider on the inside. Embrasures for cannons are generally wider on the outside. This angled opening allows for greater angles of fire.
(embrasures) In fortifications, an opening through which cannons can be fired.
An opening to either side of a merlon, along the top of a wall
The low segment of the altering high and low segments of a battlement.
An opening in a wall or parapet allowing cannon to fire through it, the gunners remaining under cover. One or both sides of the embrasure would be slanted outward to increase a weapon s angle of fire. ...