(1.) When it is manoeuvring.
(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.