That part of the rampart or wall between two bastions or two gates. When the excavation is on the side farthest from the enemy, it is called a trench. Parapet embrasures are smallest at the interior opening and wider towards the exterior. This widening is called the splay. En-barbette A gun mount set upon a platform high enough to fire over the parapet wall rather than through an embrasure.
Enfilade fire is effective because more of the position is exposed to the gunfire.
The shoulder of the bastion. The faces are the two parts of the bastion that form the salient angle. The parts of the bastion that join the faces to the ramparts. The line of fire from a flank would run parallel to the wall that it abuts and defends. A slope of earth, usually turfed, that inclines from the covered way towards the country.