Cavalry may be brought to a charge--1st, in columns; 2d, in line; and 3d, in route, or at random, _(a la deban-dade.)_ These may also be varied by charging either at a trot or a gallop. All these modes have been employed with success. In a regular charge in line the lance offers great advantages; in the melee the sabre is the best weapon; hence some military writers have proposed arming the front rank with lances, and the second with sabres, The pistol and the carabine are useless in the charge, but may sometimes be employed with advantage against convoys, outposts, and light cavalry; to fire the carabine with any effect, the troop must be at a halt. In all charges in line, especially against cavalry, the fast trot is deemed preferable to the gallop, on account of the difficulty of keeping up the alignment when the speed is increased. Lances are utterly useless in a melee, and in employing troops armed in this way, it is of the greatest importance to keep them in order and in line. In charging with the sabre against artillery the gallop may sometimes be employed, for velocity here may be more important than force. We will now consider the formation and use of _artillery_ on the field of battle. It may be laid down as a fundamental principle, that the fire of artillery should be directed on that part of the enemy's line which we design to pierce; for this fire will not only weaken this point, but will also aid the attack of the cavalry and infantry when the principal efforts are directed towards the intended point. In the defence, the artillery is usually distributed throughout the whole line, on ground favorable for its fire; but the reserve should be so placed that it can easily be brought to bear on the point where the enemy will be most likely to direct his principal attack. Artillery placed on a plain, or with ground slightly inclined in front, and using the point-blank or ricochet fire, is the most effective; very high points are unfavorable If possible, the concentric fire should be employed against the enemy's columns of attack. The position of the English artillery on the field of Waterloo, and the use of the concentric fire, furnishes one of the best examples for the disposition of this arm to be found in modern military history. The proper use of artillery on the battle-field is against the enemy's infantry and cavalry, consequently only a small part of it should be employed to respond to the fire of the enemy's batteries; not more than one third at most can be spared for this object. If possible, batteries should be established so as to take the enemy's line in flank, either by an oblique or enfilading fire. A direct fire against columns of attack, with a few light pieces thrown out to take it in flank at the same time, will always be advantageous. A direct and flank fire was employed with success by Kleist against the column of Ney at the battle of Bautzen; the French marshal was forced to change his direction.