Scrabble?! RAVELINS

Definitions of RAVELINS in various dictionaries:

A ravelin is a triangular fortification or detached outwork, located in front of the innerworks of a fortress (the curtain walls and bastions). Originally called a demi-lune, after the lunette, the ravelin is placed outside a castle and opposite a fortification curtain. The outer edges of the ravelin are so configured that it divides an assault force, and guns in the ravelin can fire upon the attacking troops as they approach the curtain. It also impedes besiegers from using their artillery to batter a breach in the curtain wall. The side of the ravelin facing the inner fortifications has at best a low wall, if any, so as not to shelter attacking forces if they have overwhelmed it or the defenders have abandoned it. Frequently ravelins have a ramp or stairs on the curtain-wall side to facilitate the movement of troops and artillery onto the ravelin. The first example of a ravelin appears in the fortifications of the Italian town of Sarzanello, and dates from 1497. The first ravelins we