FORTIFICATION. , 59 



Redan'. — A kind of rampart ia the form of an inverted V, 



having its angle toward the enemy. 

 Redoubt'. — A parapet enclosing a square or polygonal area. 

 Re-en'tering' Angle. — The angle of a work which points in- 

 ward, toward the place to be defended. 

 Relais'. — A narrow walk without the rampart, to receive the 



earth that may be washed down, and prevent its falling 



into the ditch. 

 Retirade'. — A kind of retrenchment in the body of a bastion 



or other work which is to be disputed inch by inch after 



the defences are dismantled. 

 Retired Flank. — A flank having an arc of a circle, with its 



convexity turned toward the place to be defended. 

 Revetment. — A strong wall on the outside of a rampart, in- 

 tended to support the earth. 

 Ridge. — The highest portion of the glacis proceeding from the 



salient angle of the covered way. 

 Salient Angle. — The angle of a polygon which projects out>- 



ward from the figure. All the angles of any regular 



figure are salient. 

 Scarp. — The interior slope of the ditch next to the place, at 



the foot of the rampart. 

 Sil'lon. — A work raised in the middle of a ditch, to defend it 



when it is too wide. 

 Site. — The ground occupied by a work. 

 Star-Forts. — Forts with several salient angles, in the form of 



a star. 

 Stockade'. — A fence or barrier made with stakes or posts 



planted in the earth. 

 Ta'lus. — The slope of a work, as that of a bastion, rampart, or 



parapet. 

 Tam'bour. — A kind of work formed of palisades or pieces of 



wood ten feet long, planted close together and driven firmly 



into the ground. 

 Ten' ail. — An outwork consisting of two parallel sides with a 



front, in which is a re-entering angle. It is either single 



or double. 

 Ten'aillons. — Works constructed on each side of the ravelins, 



like the lunettes, but differing in this, that one of the faces 



of the tenaillon is in the direction of the ravelin, whereas 



that of the lunette is perpendicular to it. 

 Terre-Plein (Fr. an open space). — The horizontal surface of 



