Interior gun chamber behind a fort wall The gun is fired through a protected opening in the wall (casement) Casemates protect the guns and gunners and allow a fort's guns to be arranged in multiple levels This type of fortification feature was developed during the Second American System from 1794-1807 (e g Castle Williams, New York, and was used extensively in Third American System forts from 1817-1867 (e g Fort Carroll, Baltimore, MD)
two parallel walls that are joined by short cross walls They form small rooms that are used for storage or are filled with earth to strengthen fortifications
A bombproof chamber, usually of masonry, in which cannon may be placed, to be fired through embrasures; or one capable of being used as a magazine, or for quartering troops
An armored enclosure containing a gun mounting Unlike a turret, this enclosure does not rotate
{i} armored turret for guns; protective vault used as a barracks or for storing weapons; hollow molding to form a cornice (Architecture)