Embrasure

in fortification, is an opening, hole, or aperture in a parapet, through which cannon is pointed to fire at the enemy. Embrasures are generally made from 10 to 12 feet distant from one another, every one of them being from 6 to 9 feet wide without, and 2 or 2¹⁄₂ within: their height above the platform is 2¹⁄₂ er 3 feet towards the town, and 1¹⁄₂ foot on the other side towards the field, so that the muzzle of the piece may be sunk on occasion, and brought to fire low. See Battery and Fortification.