crenellation

ampuma-aukoilla varustettujen linnoitusten rakentaminen

sakarointi A pattern along the top of a parapet (fortified wall), most often in the form of multiple, regular, rectangular spaces in the top of the wall, through which arrows or other weaponry may be shot, especially as used in medieval European architecture.
{{quote-book|year=1922|author=w:Michael Arlen|Michael Arlen|title=“Piracy”: A Romantic Chronicle of These Days|chapter=3/6/1|url=http://openlibrary.org/works/OL1519647W
The act of crenellating; adding a top row that looks like the top of a medieval castle.