24-2 SERVICE OF ARTILLERY 1

neither particularly advantageous nor disadvantageousto the besieger.

2. That the works are reveled; the revetementsof the common thickness; the height of the body ofthe place about 40 fe^t; and of the counterscarp, about20 feet; the profiles just, and the works mutually flank-ing each other; no countermines, but casemates andmagazines covered from cannon-lhot; and an ampleprovision of stores of all kinds.

3. That from 16 to 18 guns maybe mounted onthe faces A, B, of the bastions in the front A B that isattacked; and the same number upon the four facesC, D, E, F, of the ravelins.

4. That the garrison is sufficiently numerous, com-posed of veteran troops, and commanded by experi-enced and gallant officers.

25. The first step towards making out the proportion ofartillery for laying siege to the supposed fortress, (PI. 1) is todraw a plan of the attack ; and then determine the numberand nature of the pieces of ordnance, on the principles beforelaid down : the following will be the result;

Twenty-four 32 prs. tor the royal battery G.

Twenty-four 16 prs. for the batteries H, K.

Twelve 8 prs. for the richochet batteries M, O.

Twelve mortars; four of 13 inches, and eight of 10inches, to be distributed in the batteries L, N.

Twelve royal mortars to be placed in the second parallel,for covering the sappers in the third parallel, when the richo-chet firing ceases.

Six stone-mortars to be placed at Q_, in the third parallel,to. annoy the besieged in the covered way.

' 26. Upon the same principles may be computed the quan-tity of artillery necessary for the second part of the diiectattack : it will be nearly as follows ;

(PI. 2.) Five 32 prs. for battering in breach the ravelinP from A.

Four 32 prs. for silencing from the battery B, the gunson the bastion Q_ which covers the ravelin P.

Eight 32 prs. viz. five for battering in breach the bastionfrom C, and three to be planted in the battery O.

Six 32 prs. for firing from D against the upper and lowet;flank R.

Three