Upon the flanks of a line, but at such a distance as not to impede its movements, and at the same time to be unfettered in their own; the artillery may thus represent the faces of a bastion, and the line of troops the curtain. [Sidenote: 45]] 22. Is the front of a line of troops an advantageous position for a field battery? On the contrary, it is the worst possible, as offering a double object to the enemy’s fire, and greatly obstructing the movements of the troops; while a position in rear is nearly as bad, as the fire might seriously injure, or at least, greatly disquiet them. 23. In supporting an attack, what precautions are necessary? The battery should be carefully kept clear of the intended line of march of our own troops, and such points occupied as may afford the greatest annoyance to the enemy. 24. How should batteries be disposed with regard to the enemy’s troops? Generally so as to secure a cross fire on his position, and on all the ground over which he moves to the attack, endeavoring to take him at all times in the direction of his greatest dimensions; that is, obliquely or in flank when in line, and in front when formed in columns. Moderate heights, commanding as much as possible the surrounding country, should always be taken advantage of, but not such as may prevent operations in advance if required. 25. Is it imperatively necessary to confine positions for field batteries to the flanks of a line? When, from particular circumstances, the front of the army is too extended, and unavoidably divided into two lines, it may become necessary to place one or more batteries in the centre, if those on the flanks are unable to sweep the whole front; but great care must be taken not to impede the advance or retreat of the troops when required. [Sidenote: 46]] 26. Should the fire of field batteries be carried on at the same uniform rate? Certainly not; the destruction of the enemy being the object, it follows that at distant ranges, a greater degree of care is required in pointing the guns; the fire is slow and steady, and increasing in rapidity as the enemy advances, without however, impairing its precision. 27. Should the fire of field batteries be carried on in salvoes or otherwise? Never in salvoes; but in a regular manner, well sustained, and with distinct intervals between every round, commencing slowly, and increasing in rapidity as the range diminishes. 28. Is the fire of batteries more efficacious when dispersed than when concentrated? The effects of the fire will be in proportion to the number of guns brought together, and therefore, in order to strike a decisive blow, this should at once be done. 29. What projectiles are used with field guns? Solid shot, spherical case, and canister. 30. At what distance from the enemy should the several kinds of projectiles be employed with field battery pieces?