When in hollow square, the guns will be placed at the weakest angles, and the limbers in the center of the square. In passing a bridge or defile in front, the guns will be the first to pass; unless from any particular position they can more effectually _enfilade_ the _defilé_; and thereby better open the passage for the infantry. But in retiring through a _defilé_, the guns will remain to the last, to cover the retreat. _GENERAL RULE._—With very few variations, the guns should attend in all the movements of the battalion, that division of it, to which they are particularly attached; and every attention should be paid in thus adapting the movements of the guns to those of the regiment, that they be not entangled with the divisions of the line, and never so placed as to obstruct the view of the pivots, and thereby the just formation of the line; but should always seek those positions, from which the enemy can be most annoyed, and the troops to which they are attached, protected. If at any time the battalion guns of several regiments should be united and formed into brigades, their movements will then be the same as those for the artillery of the park. _Artillery of the Park._ The artillery of the park is generally divided into brigades of 4 or 6 pieces, and a reserve, according to the force and extent of the front of an army. The reserve must be composed of about ⅙ of the park, and must be placed behind the first line. If the front of the army be extensive, the reserve must be divided. The following are the principal rules for the movements and positions of the brigades of artillery: they are mostly translated from the _Aide Memoire_, a new military work. In a _defensive_ position, the guns of the largest caliber must be posted in those points, from whence the enemy can be discovered at the greatest distance, and from which may be seen the whole extent of his front. In an _offensive_ position, the weakest points of the line must be strengthened by the largest calibers; and the most distant from the enemy: those heights on which the army in advancing may rest its flanks, must be secured by them, and from which the enemy may be fired upon obliquely. The guns should be placed as much as possible under cover; this is easily done upon heights, by keeping them so far back that the muzzles are only to be seen over them: by proper attention many situations may be found of which advantage may be taken for this purpose, such as banks, ditches, &c. every where to be met with. A BATTERY in the field should never be discovered by the enemy till the very moment it is to open. The guns may be masked by being a little retired; or by being covered by troops, particularly cavalry.