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.

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,  in addition to the 100 pieces,6
Coehorn Mortars,6
Wall Pieces. 40