ARTICLE IX. How an Officer ought to cover a second line
Supposing that the first line has six squadrons to cover it, and the second line only four, these last must nevertheless be placed directly behind the right wing of the first line. With these four squadrons the officer commanding is to check the enemy, should they be disposed to make an impression on the flank of the second line. If he perceive that the enemy makes an impression on the flanks during the attack, he must hasten to their support, and attack the enemy's flank himself, taking care in doing this, that he does not expose the flank of the second line, and abandon it to the enemy.
If the first line has broken the enemy, and is mixed with it, the second line will naturally come up to it's support; but if the second line be composed of heavy cavalry that cannot move quickly enough, the officer with the party must still follow the first line, keeping himself compact, in order to receive prisoners. What follows, regards the officers of each wing of the second line.