(1.) When it is manœuvring.
(2.) When the attack would be a surprise.
(3.) When its ranks begin to waver, or when it manifests any unequivocal symptom of hesitation or intimidation.
In the three latter cases, success will usually be certain; in the two former ones, quite probable: but, in most other cases, a cavalry charge will succeed, perhaps, only one time in ten.
4. The chief duties of cavalry in a defensive battle are—
(1.) To watch the enemy's cavalry, to prevent its surprising our infantry.
(2.) To guard our troops from being outflanked.
(3.) To defend our infantry and artillery while manœuvring.
(4.) To be ready to charge the enemy the instant his attack on our troops is repulsed.
5. Used offensively, it must promptly attack—