REPORT OF CAPT. GEORGE B. M'CLELLAN. 29 



They are placed at the foot of the scarp or counterscarp, or in the middle of the ditch. The 

 trench to receive them is 1|' wide and 2^' deep. The palisades are from 2" to 3" apart. 



Stockades are double palisades, emjjloyed against light artillery. 



The military pits are from 5' to C deep, upper diameter G', lower diameter 1^'; tlie stake from 

 4" to 5" in diameter, and projects 4^' above the bottom of the pit. 



Fraises, entanglements, abattis, caltrops, &c., are also employed. 



SIEGE MATEKIALS, &c. 



The usual mathematical and surveying instruments arc provided. Tlie tools are generally 

 inferior in quality. 



Common fascine. — 6' or 12' long, 2' in circumference; withes from 1' to 2' apart. 



Battery fascine. — -18' to 21' long, 1' in diameter; withes 10" to 12" apart. 



Sap fagot. — 21' long, 10" in diameter; central stake projects 6". 



The trestles of the fascine cradles are from 2^' to 3' apart ; the stakes of which they are made 

 are 5' to 6' long, diameter 3" to 4" at the butt ; points enter the ground 3' apart, and cross 3' 

 above the ground. 



The brusb for fascines is not more than 1" in diameter. A fascine party consists of six men: 

 two for preparing the brush, one to prepare the withes, two to lay and choke the brush, one to 

 remove the fascine when completed. Each party is jjrovided with two bill-hooks, one hatchet, 

 one measuring rod, one cord to measure the circumference, and one choker. 



Gabion, — The sap gabion is 30" high, 24" in diameter, and has 9 stakes ; each stake 3^' long, 

 and from 1|" to 2" diameter. 



Battenj gabion. — 4' high, 3' in diameter, 13 stakes. In all gabions the stakes should be 8' 

 apart. 



A gabion party consists of three men, and is provided with one measuring rod, two bill-hooks, 

 and one hatchet. 



Sa}} roller. — T^' long, 4' in diameter, stuifed with wool or fascines, and closed at both ends by 

 wattling. It has IT stakes. 



The brush being cut for them, and it being only required to trim off the leaves and twigs and 

 to wattle, a party of three men can in four hours finish three sap gabions, two battery gabions, 

 or one-third of a sap roller. 



Hurdles are from 4' to 9' long ; stakes, from 4' to 7' long, 2" in diameter, and 1' apart. A 

 party of three men can make 53 square feet of hurdles in four hours, the brush being already 

 cut. 



Sand bags.— 2' long, 8" to 9" wide. 



Sods.— 18" long, 12" broad, from 5" to 6" thick. 



Average iveight of different sap materials. 



Pounds. 



Common fascine, 6^' long, 8|" diameter 31^ 



Battery fascine, 20' long, 1' diameter 288 



Sap fagot 17 



Sap gabion 43 to 54 



Sap roller, empty 324 



Sap roller, stuffed with fascines 1,080 to 1,296 



Sand bag, filled 36 to 40 



