three sentences are repeated from VII. SS. 12-14 --
in order to emphasize their importance, the commentators seem to
think. I prefer to regard them as interpolated here in order to
form an antecedent to the following words. With regard to local
guides, Sun Tzu might have added that there is always the risk of
going wrong, either through their treachery or some
misunderstanding such as Livy records (XXII. 13): Hannibal, we
are told, ordered a guide to lead him into the neighborhood of
Casinum, where there was an important pass to be occupied; but
his Carthaginian accent, unsuited to the pronunciation of Latin
names, caused the guide to understand Casilinum instead of
Casinum, and turning from his proper route, he took the army in
that direction, the mistake not being discovered until they had
almost arrived.]

53. To be ignored of any one of the following four or five
principles does not befit a warlike prince.
54. When a warlike prince attacks a powerful state, his
generalship shows itself in preventing the concentration of the
enemy's forces. He overawes his opponents, and their allies are
prevented from joining against him.

[Mei Tao-ch`en constructs one of the chains of reasoning
that are so much affected by the Chinese: "In attacking a
powerful state, if you can divide her forces, you will have a
superiority in strength; if you have a superiority in strength,
you will overawe the enemy; if you overawe the enemy, the
neighboring states will be frightened; and if the neighboring
states are frightened, the enemy's allies will be prevented from
joining her." The following gives a stronger meaning: "If the
great state has once been defeated (before she has had time to
summon her allies), then the lesser states will hold aloof and
refrain from massing their forces." Ch`en Hao and Chang Yu take
the sentence in quite another way. The former says: "Powerful
though a prince may be, if he attacks a large state, he will be
unable to raise enough troops, and must rely to some extent on
external aid; if he dispenses with this, and with overweening
confidence in his own strength, simply tries to intimidate the
enemy, he will surely be defeated." Chang Yu puts his view thus:
"If we recklessly attack a large state, our own people will be
discontented and hang back. But if (as will then be the case)
our display of military force is inferior by half to that of the
enemy, th