2. What number and kind of pieces are required for the armaments of forts on the sea-board? In our service they are prescribed by the War Department, according to the character and extent of the work. 3. What disposition should be made of heavy and light pieces in a fortification? Heavy pieces should be employed on the salients of the work, or for enfilading channels where a long range is required; light pieces, where the range is shorter. [Sidenote: 36]] PART I. SECTION VII. SIEGE ARTILLERY. 1. How are siege-guns mounted? Usually on travelling-carriages, with limbers. 2. Of what number and kind of pieces is a siege train composed? This must altogether depend on circumstances; but the following general principles may be observed in assigning the proportion of different kinds and calibres, and the relative quantity of other supplies for a train of 100 pieces: GUNS. { 24-pdr., about one-half the whole number, 50 { 18-pdr. or 12-pdr., one-tenth, 10 HOWITZERS. 8-in. siege, one-fourth, 25 MORTARS. { 10-in. siege, one-eighth, 12 { 8-in. siege, 3 STONE-MORTARS, { } 6 COEHORN MORTARS, {in addition to the 100 pieces,} 6 WALL PIECES, 40 [Sidenote: 37]] CARRIAGES. For 24-pdr. guns, and 8-in. howitzers, one-fifth spare, 90 For 18-pdr. and 12-pdr. guns, 12 For 10-in. mortars and stone-mortars, one-sixth spare, 21 For 8-in. mortars, 4 _Mortar-wagons_, 1 for each 10-in. mortar and bed, for each stone mortar and bed, and for three 8-in. mortar and beds, 38 _Wagons_ for transporting implements, intrenching and miner’s tools, laboratory tools and utensils and other stores, each loaded with about 2,700 lbs., say, 140 _Carts_ (carrying balls, &c. on the march), 50 _Park battery-wagons_, fully equipped, 28 _Park forges_, “ “ 8 _Sling carts_, large, 5 _Do._ hand, 4 DRAUGHT HORSES.