that part of the curtain from whence the face of the opposite bastion may be discovered, and is the distance between the lines rasant and fichant, which are rejected by most engineers, as being liable to be ruined at the beginning of a siege, especially when made of sandy earth. The second parapet, which may be raised behind the former, is of no use; for it neither discovers nor defends the face of the opposite bastion: besides, it shortens the flank, which is the true defence; and the continual fire of the besiegers’ cannon will never suffer the garrison to raise a second parapet. This second flank defends very obliquely the opposite face, and is to be used only in a place attacked by an army without artillery.
| Retired | - | Flank, | - | ||
| Low | |||||
| Covered |
the platform of the casemate, which lies hid in the bastion. These retired flanks are a great defence to the opposite bastion and passage of the ditch; because the besiegers cannot see, nor easily dismount their guns.
Flank prolonged, in fortification, is the extending of the flank from the angle of the epaule to the exterior side, when the angle of the flank is a right one.
Concave Flank, is that which is made in the arc of a semi-circle bending outwards.
Flanks of a frontier. Are the different salient points of a large extent of territory, between each of which it would be impolitic for any invading army to hazard an advanced position. The late celebrated gen. Lloyd (whose accuracy of observation and solidity of conclusion with respect to the iron frontier of old France have been universally acknowleged) has furnished military men with a full and succinct account of the relative positions upon it. This long line he begins at Basle in Switzerland, and runs into various directions from thence to Dunkirk in old French Flanders, he divides it into three parts, and considers each of them separately. The first part goes from Basle to Landau and covers old Alsace, near 130 miles in length. The second from Landau to Sedan on the Moselle, covers ancient Lorrain on the side of Treves, Deux-Ponts, Luxemburgh, and Limburg; 190 miles in length. From Sedan down the Meuse to Charlemont in old Flanders, and thence to Dunkirk, is the third part, and is about 150 miles; so that the whole natural frontier of old France was 470 miles. The greatest part, if not the whole of which, is in the shape of a horse shoe, and presents impregnable flanks. An anonymous writer, after referring the reader to general Lloyd for a specific account of the first and second lines of the French frontier, has made the following observations relative to the third and last which runs from Sedan down the Meuse to Charlemont, from thence to Dunkirk, and is 150 miles in length. His words are—While the duke of Brunswick and the king of Prussia were ruining the most formidable armies in Europe by endeavoring to penetrate a few miles into Lorrain and Champagne through the first and second line, (without having previously secured the two flanks,) the French with redoubled activity operated upon the third, and finally subdued all Flanders. Those very difficulties, in fact, which presented themselves to oppose the progress of the allied army into France, facilitated every excursion on her part, as the direction of the line which goes from Sedan to Landau is concave towards that part of Germany.
The remainder of this line, (within which so many faults were committed, or rather could not be avoided, because the impression itself was founded in error,) runs to Dunkirk. It has been the scene of successive wars for near two centuries, the most expensive, bloody, and durable of any recorded in the annals of mankind. This line, continues general Lloyd, is stronger by art than nature, having a prodigious number of strong fortresses and posts upon it, moreover it projects in many places, so that an enemy can enter no where, without having some of them in front and on his flanks.
The United States are flanked by Canada and Florida.
Flanks, in farriery, a wrench, or any other grief in the back of a horse.
To Flank, in fortification, is to erect a battery which may play upon an enemy’s works on the right or left without being exposed to his line of fire. Any fortification, which has no defence but right forward, is faulty; and to make it complete, one part ought to flank the other.