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Title: The Art of War

Author: active 6th century B.C. Sunzi

Translator: Lionel Giles

Release date: December 28, 2005 [eBook #17405]
Most recently updated: October 30, 2021

Language: English

Original publication: , 1910

Other information and formats: www.gutenberg.org/ebooks/17405

*** START OF THE PROJECT GUTENBERG EBOOK THE ART OF
WAR ***

S U N T Z U O N T H E A RT O F
WA R
THE OLDEST MILITARY TREATISE IN THE
WORLD
Translated from the Chinese
By LIONEL GILES, M.A. (1910)

[This is the basic text of Sun Tzŭ on the Art of War. It was
extracted from Mr. Giles’ complete work as titled above. The
commentary itself, which, of course includes this work
embedded within it, has been released as Project
Gutenberg’s eBook #132.]

Contents

CHAPTER I. LAYING PLANS
CHAPTER II. WAGING WAR
CHAPTER III. ATTACK BY STRATAGEM
CHAPTER IV. TACTICAL DISPOSITIONS
CHAPTER V. ENERGY
CHAPTER VI. WEAK POINTS AND STRONG
CHAPTER VII. MANŒUVERING
CHAPTER VIII. VARIATION OF TACTICS
CHAPTER IX. THE ARMY ON THE MARCH
CHAPTER X. TERRAIN
CHAPTER XI. THE NINE SITUATIONS
CHAPTER XII. THE ATTACK BY FIRE
CHAPTER XIII. THE USE OF SPIES

I. LAYING PLANS

1. Sun Tzŭ said: The art of war is of vital importance to the State.
2. It is a matter of life and death, a road either to safety or to ruin. Hence
it is a subject of inquiry which can on no account be neglected.
3. The art of war, then, is governed by five constant factors, to be taken
into account in one’s deliberations, when seeking to determine the
conditions obtaining in the field.
4. These are: (1) The Moral Law; (2) Heaven; (3) Earth; (4) The
Commander; (5) Method and discipline.
5, 6. The Moral Law causes the people to be in complete accord with
their ruler, so that they will follow him regardless of their lives, undismayed
by any danger.
7. Heaven signifies night and day, cold and heat, times and seasons.
8. Earth comprises distances, great and small; danger and security; open
ground and narrow passes; the chances of life and death.
9. The Commander stands for the virtues of wisdom, sincerity,
benevolence, courage and strictness.
10. By Method and discipline are to be understood the marshalling of the
army in its proper subdivisions, the gradations of rank among the officers,
the maintenance of roads by which supplies may reach the army, and the
control of military expenditure.
11. These five heads should be familiar to every general: he who knows
them will be victorious; he who knows them not will fail.
12. Therefore, in your deliberations, when seeking to determine the
military conditions, let them be made the basis of a comparison, in this
wise:—
13. (1) Which of the two sovereigns is imbued with the Moral law?
(2) Which of the two generals has most ability?

(3) With whom lie the advantages derived from Heaven and Earth?
(4) On which side is discipline most rigorously enforced?
(5) Which army is the stronger?
(6) On which side are officers and men more highly trained?
(7) In which army is there the greater constancy both in reward and
punishment?
14. By means of these seven considerations I can forecast victory or
defeat.
15. The general that hearkens to my counsel and acts upon it, will
conquer: let such a one be retained in command! The general that hearkens
not to my counsel nor acts upon it, will suffer defeat:—let such a one be
dismissed!
16. While heeding the profit of my counsel, avail yourself also of any
helpful circumstances over and beyond the ordinary rules.
17. According as circumstances are favourable, one should modify one’s
plans.
18. All warfare is based on deception.
19. Hence, when able to attack, we must seem unable; when using our
forces, we must seem inactive; when we are near, we must make the enemy
believe we are far away; when far away, we must make him believe we are
near.
20. Hold out baits to entice the enemy. Feign disorder, and crush him.
21. If he is secure at all points, be prepared for him. If he is in superior
strength, evade him.
22. If your opponent is of choleric temper, seek to irritate him. Pretend to
be weak, that he may grow arrogant.
23. If he is taking his ease, give him no rest. If his forces are united,
separate them.
24. Attack him where he is unprepared, appear where you are not
expected.
25. These military devices, leading to victory, must not be divulged
beforehand.
26. Now the general who wins a battle makes many calculations in his
temple ere the battle is fought. The general who loses a battle makes but

few calculations beforehand. Thus do many calculations lead to victory, and
few calculations to defeat: how much more no calculation at all! It is by
attention to this point that I can foresee who is likely to win or lose.

II. WAGING WAR

1. Sun Tzŭ said: In the operations of war, where there are in the field a
thousand swift chariots, as many heavy chariots, and a hundred thousand
mail-clad soldiers, with provisions enough to carry them a thousand li, the
expenditure at home and at the front, including entertainment of guests,
small items such as glue and paint, and sums spent on chariots and armour,
will reach the total of a thousand ounces of silver per day. Such is the cost
of raising an army of 100,000 men.
2. When you engage in actual fighting, if victory is long in coming, the
men’s weapons will grow dull and their ardour will be damped. If you lay
siege to a town, you will exhaust your strength.
3. Again, if the campaign is protracted, the resources of the State will not
be equal to the strain.
4. Now, when your weapons are dulled, your ardour damped, your
strength exhausted and your treasure spent, other chieftains will spring up
to take advantage of your extremity. Then no man, however wise, will be
able to avert the consequences that must ensue.
5. Thus, though we have heard of stupid haste in war, cleverness has
never been seen associated with long delays.
6. There is no instance of a country having benefited from prolonged
warfare.
7. It is only one who is thoroughly acquainted with the evils of war that
can thoroughly understand the profitable way of carrying it on.
8. The skilful soldier does not raise a second levy, neither are his supply-
waggons loaded more than twice.
9. Bring war material with you from home, but forage on the enemy.
Thus the army will have food enough for its needs.

10. Poverty of the State exchequer causes an army to be maintained by
contributions from a distance. Contributing to maintain an army at a
distance causes the people to be impoverished.
11. On the other hand, the proximity of an army causes prices to go up;
and high prices cause the people’s substance to be drained away.
12. When their substance is drained away, the peasantry will be afflicted
by heavy exactions.
13, 14. With this loss of substance and exhaustion of strength, the homes
of the people will be stripped bare, and three-tenths of their incomes will be
dissipated; while Government expenses for broken chariots, worn-out
horses, breast-plates and helmets, bows and arrows, spears and shields,
protective mantlets, draught-oxen and heavy waggons, will amount to four-
tenths of its total revenue.
15. Hence a wise general makes a point of foraging on the enemy. One
cartload of the enemy’s provisions is equivalent to twenty of one’s own, and
likewise a single picul of his provender is equivalent to twenty from one’s
own store.
16. Now in order to kill the enemy, our men must be roused to anger; that
there may be advantage from defeating the enemy, they must have their
rewards.
17. Therefore in chariot fighting, when ten or more chariots have been
taken, those should be rewarded who took the first. Our own flags should be
substituted for those of the enemy, and the chariots mingled and used in
conjunction with ours. The captured soldiers should be kindly treated and
kept.
18. This is called, using the conquered foe to augment one’s own
strength.
19. In war, then, let your great object be victory, not lengthy campaigns.
20. Thus it may be known that the leader of armies is the arbiter of the
people’s fate, the man on whom it depends whether the nation shall be in
peace or in peril.

III. ATTACK BY STRATAGEM

1. Sun Tzŭ said: In the practical art of war, the best thing of all is to take
the enemy’s country whole and intact; to shatter and destroy it is not so
good. So, too, it is better to capture an army entire than to destroy it, to
capture a regiment, a detachment or a company entire than to destroy them.
2. Hence to fight and conquer in all your battles is not supreme
excellence; supreme excellence consists in breaking the enemy’s resistance
without fighting.
3. Thus the highest form of generalship is to baulk the enemy’s plans; the
next best is to prevent the junction of the enemy’s forces; the next in order
is to attack the enemy’s army in the field; and the worst policy of all is to
besiege walled cities.
4. The rule is, not to besiege walled cities if it can possibly be avoided.
The preparation of mantlets, movable shelters, and various implements of
war, will take up three whole months; and the piling up of mounds over
against the walls will take three months more.
5. The general, unable to control his irritation, will launch his men to the
assault like swarming ants, with the result that one-third of his men are
slain, while the town still remains untaken. Such are the disastrous effects
of a siege.
6. Therefore the skilful leader subdues the enemy’s troops without any
fighting; he captures their cities without laying siege to them; he overthrows
their kingdom without lengthy operations in the field.
7. With his forces intact he will dispute the mastery of the Empire, and
thus, without losing a man, his triumph will be complete. This is the method
of attacking by stratagem.
8. It is the rule in war, if our forces are ten to the enemy’s one, to
surround him; if five to one, to attack him; if twice as numerous, to divide
our army into two.

9. If equally matched, we can offer battle; if slightly inferior in numbers,
we can avoid the enemy; if quite unequal in every way, we can flee from
him.
10. Hence, though an obstinate fight may be made by a small force, in the
end it must be captured by the larger force.
11. Now the general is the bulwark of the State: if the bulwark is
complete at all points; the State will be strong; if the bulwark is defective,
the State will be weak.
12. There are three ways in which a ruler can bring misfortune upon his
army:—
13. (1) By commanding the army to advance or to retreat, being ignorant
of the fact that it cannot obey. This is called hobbling the army.
14. (2) By attempting to govern an army in the same way as he
administers a kingdom, being ignorant of the conditions which obtain in an
army. This causes restlessness in the soldier’s minds.
15. (3) By employing the officers of his army without discrimination,
through ignorance of the military principle of adaptation to circumstances.
This shakes the confidence of the soldiers.
16. But when the army is restless and distrustful, trouble is sure to come
from the other feudal princes. This is simply bringing anarchy into the
army, and flinging victory away.
17. Thus we may know that there are five essentials for victory:
(1) He will win who knows when to fight and when not to fight.
(2) He will win who knows how to handle both superior and inferior forces.
(3) He will win whose army is animated by the same spirit throughout all its
ranks.
(4) He will win who, prepared himself, waits to take the enemy unprepared.
(5) He will win who has military capacity and is not interfered with by the
sovereign.
Victory lies in the knowledge of these five points.
18. Hence the saying: If you know the enemy and know yourself, you
need not fear the result of a hundred battles. If you know yourself but not
the enemy, for every victory gained you will also suffer a defeat. If you
know neither the enemy nor yourself, you will succumb in every battle.

IV. TACTICAL DISPOSITIONS

1. Sun Tzŭ said: The good fighters of old first put themselves beyond the
possibility of defeat, and then waited for an opportunity of defeating the
enemy.
2. To secure ourselves against defeat lies in our own hands, but the
opportunity of defeating the enemy is provided by the enemy himself.
3. Thus the good fighter is able to secure himself against defeat, but
cannot make certain of defeating the enemy.
4. Hence the saying: One may know how to conquer without being able
to do it.
5. Security against defeat implies defensive tactics; ability to defeat the
enemy means taking the offensive.
6. Standing on the defensive indicates insufficient strength; attacking, a
superabundance of strength.
7. The general who is skilled in defence hides in the most secret recesses
of the earth; he who is skilled in attack flashes forth from the topmost
heights of heaven. Thus on the one hand we have ability to protect
ourselves; on the other, a victory that is complete.
8. To see victory only when it is within the ken of the common herd is
not the acme of excellence.
9. Neither is it the acme of excellence if you fight and conquer and the
whole Empire says, “Well done!”
10. To lift an autumn hair is no sign of great strength; to see sun and
moon is no sign of sharp sight; to hear the noise of thunder is no sign of a
quick ear.
11. What the ancients called a clever fighter is one who not only wins,
but excels in winning with ease.

12. Hence his victories bring him neither reputation for wisdom nor
credit for courage.
13. He wins his battles by making no mistakes. Making no mistakes is
what establishes the certainty of victory, for it means conquering an enemy
that is already defeated.
14. Hence the skilful fighter puts himself into a position which makes
defeat impossible, and does not miss the moment for defeating the enemy.
15. Thus it is that in war the victorious strategist only seeks battle after
the victory has been won, whereas he who is destined to defeat first fights
and afterwards looks for victory.
16. The consummate leader cultivates the moral law, and strictly adheres
to method and discipline; thus it is in his power to control success.
17. In respect of military method, we have, firstly, Measurement;
secondly, Estimation of quantity; thirdly, Calculation; fourthly, Balancing of
chances; fifthly, Victory.
18. Measurement owes its existence to Earth; Estimation of quantity to
Measurement; Calculation to Estimation of quantity; Balancing of chances
to Calculation; and Victory to Balancing of chances.
19. A victorious army opposed to a routed one, is as a pound’s weight
placed in the scale against a single grain.
20. The onrush of a conquering force is like the bursting of pent-up
waters into a chasm a thousand fathoms deep. So much for tactical
dispositions.

V. ENERGY

1. Sun Tzŭ said: The control of a large force is the same principle as the
control of a few men: it is merely a question of dividing up their numbers.
2. Fighting with a large army under your command is nowise different
from fighting with a small one: it is merely a question of instituting signs
and signals.
3. To ensure that your whole host may withstand the brunt of the enemy’s
attack and remain unshaken—this is effected by manœuvers direct and
indirect.
4. That the impact of your army may be like a grindstone dashed against
an egg—this is effected by the science of weak points and strong.
5. In all fighting, the direct method may be used for joining battle, but
indirect methods will be needed in order to secure victory.
6. Indirect tactics, efficiently applied, are inexhaustible as Heaven and
Earth, unending as the flow of rivers and streams; like the sun and moon,
they end but to begin anew; like the four seasons, they pass away but to
return once more.
7. There are not more than five musical notes, yet the combinations of
these five give rise to more melodies than can ever be heard.
8. There are not more than five primary colours (blue, yellow, red, white,
and black), yet in combination they produce more hues than can ever be
seen.
9. There are not more than five cardinal tastes (sour, acrid, salt, sweet,
bitter), yet combinations of them yield more flavours than can ever be
tasted.
10. In battle, there are not more than two methods of attack—the direct
and the indirect; yet these two in combination give rise to an endless series
of manœuvers.

11. The direct and the indirect lead on to each other in turn. It is like
moving in a circle—you never come to an end. Who can exhaust the
possibilities of their combination?
12. The onset of troops is like the rush of a torrent which will even roll
stones along in its course.
13. The quality of decision is like the well-timed swoop of a falcon which
enables it to strike and destroy its victim.
14. Therefore the good fighter will be terrible in his onset, and prompt in
his decision.
15. Energy may be likened to the bending of a crossbow; decision, to the
releasing of the trigger.
16. Amid the turmoil and tumult of battle, there may be seeming disorder
and yet no real disorder at all; amid confusion and chaos, your array may be
without head or tail, yet it will be proof against defeat.
17. Simulated disorder postulates perfect discipline; simulated fear
postulates courage; simulated weakness postulates strength.
18. Hiding order beneath the cloak of disorder is simply a question of
subdivision; concealing courage under a show of timidity presupposes a
fund of latent energy; masking strength with weakness is to be effected by
tactical dispositions.
19. Thus one who is skilful at keeping the enemy on the move maintains
deceitful appearances, according to which the enemy will act. He sacrifices
something, that the enemy may snatch at it.
20. By holding out baits, he keeps him on the march; then with a body of
picked men he lies in wait for him.
21. The clever combatant looks to the effect of combined energy, and
does not require too much from individuals. Hence his ability to pick out
the right men and utilise combined energy.
22. When he utilises combined energy, his fighting men become as it
were like unto rolling logs or stones. For it is the nature of a log or stone to
remain motionless on level ground, and to move when on a slope; if four-
cornered, to come to a standstill, but if round-shaped, to go rolling down.
23. Thus the energy developed by good fighting men is as the momentum
of a round stone rolled down a mountain thousands of feet in height. So

much on the subject of energy.

VI. WEAK POINTS AND STRONG

1. Sun Tzŭ said: Whoever is first in the field and awaits the coming of the
enemy, will be fresh for the fight; whoever is second in the field and has to
hasten to battle, will arrive exhausted.
2. Therefore the clever combatant imposes his will on the enemy, but
does not allow the enemy’s will to be imposed on him.
3. By holding out advantages to him, he can cause the enemy to approach
of his own accord; or, by inflicting damage, he can make it impossible for
the enemy to draw near.
4. If the enemy is taking his ease, he can harass him; if well supplied with
food, he can starve him out; if quietly encamped, he can force him to move.
5. Appear at points which the enemy must hasten to defend; march
swiftly to places where you are not expected.
6. An army may march great distances without distress, if it marches
through country where the enemy is not.
7. You can be sure of succeeding in your attacks if you only attack places
which are undefended.You can ensure the safety of your defence if you only
hold positions that cannot be attacked.
8. Hence that general is skilful in attack whose opponent does not know
what to defend; and he is skilful in defence whose opponent does not know
what to attack.
9. O divine art of subtlety and secrecy! Through you we learn to be
invisible, through you inaudible; and hence we can hold the enemy’s fate in
our hands.
10. You may advance and be absolutely irresistible, if you make for the
enemy’s weak points; you may retire and be safe from pursuit if your
movements are more rapid than those of the enemy.

11. If we wish to fight, the enemy can be forced to an engagement even
though he be sheltered behind a high rampart and a deep ditch. All we need
do is attack some other place that he will be obliged to relieve.
12. If we do not wish to fight, we can prevent the enemy from engaging
us even though the lines of our encampment be merely traced out on the
ground. All we need do is to throw something odd and unaccountable in his
way.
13. By discovering the enemy’s dispositions and remaining invisible
ourselves, we can keep our forces concentrated, while the enemy’s must be
divided.
14. We can form a single united body, while the enemy must split up into
fractions. Hence there will be a whole pitted against separate parts of a
whole, which means that we shall be many to the enemy’s few.
15. And if we are able thus to attack an inferior force with a superior one,
our opponents will be in dire straits.
16. The spot where we intend to fight must not be made known; for then
the enemy will have to prepare against a possible attack at several different
points; and his forces being thus distributed in many directions, the
numbers we shall have to face at any given point will be proportionately
few.
17. For should the enemy strengthen his van, he will weaken his rear;
should he strengthen his rear, he will weaken his van; should he strengthen
his left, he will weaken his right; should he strengthen his right, he will
weaken his left. If he sends reinforcements everywhere, he will everywhere
be weak.
18. Numerical weakness comes from having to prepare against possible
attacks; numerical strength, from compelling our adversary to make these
preparations against us.
19. Knowing the place and the time of the coming battle, we may
concentrate from the greatest distances in order to fight.
20. But if neither time nor place be known, then the left wing will be
impotent to succour the right, the right equally impotent to succour the left,
the van unable to relieve the rear, or the rear to support the van. How much
more so if the furthest portions of the army are anything under a hundred li
apart, and even the nearest are separated by several li!

21. Though according to my estimate the soldiers of Yüeh exceed our
own in number, that shall advantage them nothing in the matter of victory. I
say then that victory can be achieved.
22. Though the enemy be stronger in numbers, we may prevent him from
fighting. Scheme so as to discover his plans and the likelihood of their
success.
23. Rouse him, and learn the principle of his activity or inactivity. Force
him to reveal himself, so as to find out his vulnerable spots.
24. Carefully compare the opposing army with your own, so that you
may know where strength is superabundant and where it is deficient.
25. In making tactical dispositions, the highest pitch you can attain is to
conceal them; conceal your dispositions, and you will be safe from the
prying of the subtlest spies, from the machinations of the wisest brains.
26. How victory may be produced for them out of the enemy’s own
tactics—that is what the multitude cannot comprehend.
27. All men can see the tactics whereby I conquer, but what none can see
is the strategy out of which victory is evolved.
28. Do not repeat the tactics which have gained you one victory, but let
your methods be regulated by the infinite variety of circumstances.
29. Military tactics are like unto water; for water in its natural course
runs away from high places and hastens downwards.
30. So in war, the way is to avoid what is strong and to strike at what is
weak.
31. Water shapes its course according to the nature of the ground over
which it flows; the soldier works out his victory in relation to the foe whom
he is facing.
32. Therefore, just as water retains no constant shape, so in warfare there
are no constant conditions.
33. He who can modify his tactics in relation to his opponent and thereby
succeed in winning, may be called a heaven-born captain.
34. The five elements (water, fire, wood, metal, earth) are not always
equally predominant; the four seasons make way for each other in turn.
There are short days and long; the moon has its periods of waning and
waxing.

VII. MANŒUVERING

1. Sun Tzŭ said: In war, the general receives his commands from the
sovereign.
2. Having collected an army and concentrated his forces, he must blend
and harmonise the different elements thereof before pitching his camp.
3. After that, comes tactical manœuvering, than which there is nothing
more difficult. The difficulty of tactical manœuvering consists in turning the
devious into the direct, and misfortune into gain.
4. Thus, to take a long and circuitous route, after enticing the enemy out
of the way, and though starting after him, to contrive to reach the goal
before him, shows knowledge of the artifice of deviation.
5. Manœuvering with an army is advantageous; with an undisciplined
multitude, most dangerous.
6. If you set a fully equipped army in march in order to snatch an
advantage, the chances are that you will be too late. On the other hand, to
detach a flying column for the purpose involves the sacrifice of its baggage
and stores.
7. Thus, if you order your men to roll up their buff-coats, and make
forced marches without halting day or night, covering double the usual
distance at a stretch, doing a hundred li in order to wrest an advantage, the
leaders of all your three divisions will fall into the hands of the enemy.
8. The stronger men will be in front, the jaded ones will fall behind, and
on this plan only one-tenth of your army will reach its destination.
9. If you march fifty li in order to outmanœuver the enemy, you will lose
the leader of your first division, and only half your force will reach the goal.
10. If you march thirty li with the same object, two-thirds of your army
will arrive.

11. We may take it then that an army without its baggage-train is lost;
without provisions it is lost; without bases of supply it is lost.
12. We cannot enter into alliances until we are acquainted with the
designs of our neighbours.
13. We are not fit to lead an army on the march unless we are familiar
with the face of the country—its mountains and forests, its pitfalls and
precipices, its marshes and swamps.
14. We shall be unable to turn natural advantages to account unless we
make use of local guides.
15. In war, practise dissimulation, and you will succeed. Move only if
there is a real advantage to be gained.
16. Whether to concentrate or to divide your troops, must be decided by
circumstances.
17. Let your rapidity be that of the wind, your compactness that of the
forest.
18. In raiding and plundering be like fire, in immovability like a
mountain.
19. Let your plans be dark and impenetrable as night, and when you
move, fall like a thunderbolt.
20. When you plunder a countryside, let the spoil be divided amongst
your men; when you capture new territory, cut it up into allotments for the
benefit of the soldiery.
21. Ponder and deliberate before you make a move.
22. He will conquer who has learnt the artifice of deviation. Such is the
art of manœuvering.
23. The Book of Army Management says: On the field of battle, the
spoken word does not carry far enough: hence the institution of gongs and
drums. Nor can ordinary objects be seen clearly enough: hence the
institution of banners and flags.
24. Gongs and drums, banners and flags, are means whereby the ears and
eyes of the host may be focussed on one particular point.
25. The host thus forming a single united body, is it impossible either for
the brave to advance alone, or for the cowardly to retreat alone. This is the
art of handling large masses of men.

26. In night-fighting, then, make much use of signal-fires and drums, and
in fighting by day, of flags and banners, as a means of influencing the ears
and eyes of your army.
27. A whole army may be robbed of its spirit; a commander-in-chief may
be robbed of his presence of mind.
28. Now a soldier’s spirit is keenest in the morning; by noonday it has
begun to flag; and in the evening, his mind is bent only on returning to
camp.
29. A clever general, therefore, avoids an army when its spirit is keen, but
attacks it when it is sluggish and inclined to return. This is the art of
studying moods.
30. Disciplined and calm, to await the appearance of disorder and hubbub
amongst the enemy:—this is the art of retaining self-possession.
31. To be near the goal while the enemy is still far from it, to wait at ease
while the enemy is toiling and struggling, to be well-fed while the enemy is
famished:—this is the art of husbanding one’s strength.
32. To refrain from intercepting an enemy whose banners are in perfect
order, to refrain from attacking an army drawn up in calm and confident
array:—this is the art of studying circumstances.
33. It is a military axiom not to advance uphill against the enemy, nor to
oppose him when he comes downhill.
34. Do not pursue an enemy who simulates flight; do not attack soldiers
whose temper is keen.
35. Do not swallow a bait offered by the enemy. Do not interfere with an
army that is returning home.
36. When you surround an army, leave an outlet free. Do not press a
desperate foe too hard.
37. Such is the art of warfare.

VIII. VARIATION OF TACTICS

1. Sun Tzŭ said: In war, the general receives his commands from the
sovereign, collects his army and concentrates his forces.
2. When in difficult country, do not encamp. In country where high roads
intersect, join hands with your allies. Do not linger in dangerously isolated
positions. In hemmed-in situations, you must resort to stratagem. In a
desperate position, you must fight.
3. There are roads which must not be followed, armies which must be not
attacked, towns which must not be besieged, positions which must not be
contested, commands of the sovereign which must not be obeyed.
4. The general who thoroughly understands the advantages that
accompany variation of tactics knows how to handle his troops.
5. The general who does not understand these, may be well acquainted
with the configuration of the country, yet he will not be able to turn his
knowledge to practical account.
6. So, the student of war who is unversed in the art of war of varying his
plans, even though he be acquainted with the Five Advantages, will fail to
make the best use of his men.
7. Hence in the wise leader’s plans, considerations of advantage and of
disadvantage will be blended together.
8. If our expectation of advantage be tempered in this way, we may
succeed in accomplishing the essential part of our schemes.
9. If, on the other hand, in the midst of difficulties we are always ready to
seize an advantage, we may extricate ourselves from misfortune.
10. Reduce the hostile chiefs by inflicting damage on them; and make
trouble for them, and keep them constantly engaged; hold out specious
allurements, and make them rush to any given point.

11. The art of war teaches us to rely not on the likelihood of the enemy’s
not coming, but on our own readiness to receive him; not on the chance of
his not attacking, but rather on the fact that we have made our position
unassailable.
12. There are five dangerous faults which may affect a general:
(1) Recklessness, which leads to destruction;
(2) cowardice, which leads to capture;
(3) a hasty temper, which can be provoked by insults;
(4) a delicacy of honour which is sensitive to shame;
(5) over-solicitude for his men, which exposes him to worry and trouble.
13. These are the five besetting sins of a general, ruinous to the conduct
of war.
14. When an army is overthrown and its leader slain, the cause will
surely be found among these five dangerous faults. Let them be a subject of
meditation.

IX. THE ARMY ON THE MARCH

1. Sun Tzŭ said: We come now to the question of encamping the army,
and observing signs of the enemy. Pass quickly over mountains, and keep in
the neighbourhood of valleys.
2. Camp in high places, facing the sun. Do not climb heights in order to
fight. So much for mountain warfare.
3. After crossing a river, you should get far away from it.
4. When an invading force crosses a river in its onward march, do not
advance to meet it in mid-stream. It will be best to let half the army get
across, and then deliver your attack.
5. If you are anxious to fight, you should not go to meet the invader near
a river which he has to cross.
6. Moor your craft higher up than the enemy, and facing the sun. Do not
move up-stream to meet the enemy. So much for river warfare.
7. In crossing salt-marshes, your sole concern should be to get over them
quickly, without any delay.
8. If forced to fight in a salt-marsh, you should have water and grass near
you, and get your back to a clump of trees. So much for operations in salt-
marshes.
9. In dry, level country, take up an easily accessible position with rising
ground to your right and on your rear, so that the danger may be in front,
and safety lie behind. So much for campaigning in flat country.
10. These are the four useful branches of military knowledge which
enabled the Yellow Emperor to vanquish four several sovereigns.
11. All armies prefer high ground to low, and sunny places to dark.
12. If you are careful of your men, and camp on hard ground, the army
will be free from disease of every kind, and this will spell victory.

13. When you come to a hill or a bank, occupy the sunny side, with the
slope on your right rear. Thus you will at once act for the benefit of your
soldiers and utilise the natural advantages of the ground.
14. When, in consequence of heavy rains up-country, a river which you
wish to ford is swollen and flecked with foam, you must wait until it
subsides.
15. Country in which there are precipitous cliffs with torrents running
between, deep natural hollows, confined places, tangled thickets, quagmires
and crevasses, should be left with all possible speed and not approached.
16. While we keep away from such places, we should get the enemy to
approach them; while we face them, we should let the enemy have them on
his rear.
17. If in the neighbourhood of your camp there should be any hilly
country, ponds surrounded by aquatic grass, hollow basins filled with reeds,
or woods with thick undergrowth, they must be carefully routed out and
searched; for these are places where men in ambush or insidious spies are
likely to be lurking.
18. When the enemy is close at hand and remains quiet, he is relying on
the natural strength of his position.
19. When he keeps aloof and tries to provoke a battle, he is anxious for
the other side to advance.
20. If his place of encampment is easy of access, he is tendering a bait.
21. Movement amongst the trees of a forest shows that the enemy is
advancing. The appearance of a number of screens in the midst of thick
grass means that the enemy wants to make us suspicious.
22. The rising of birds in their flight is the sign of an ambuscade. Startled
beasts indicate that a sudden attack is coming.
23. When there is dust rising in a high column, it is the sign of chariots
advancing; when the dust is low, but spread over a wide area, it betokens
the approach of infantry. When it branches out in different directions, it
shows that parties have been sent to collect firewood. A few clouds of dust
moving to and fro signify that the army is encamping.
24. Humble words and increased preparations are signs that the enemy is
about to advance. Violent language and driving forward as if to the attack
are signs that he will retreat.

25. When the light chariots come out first and take up a position on the
wings, it is a sign that the enemy is forming for battle.
26. Peace proposals unaccompanied by a sworn covenant indicate a plot.
27. When there is much running about and the soldiers fall into rank, it
means that the critical moment has come.
28. When some are seen advancing and some retreating, it is a lure.
29. When the soldiers stand leaning on their spears, they are faint from
want of food.
30. If those who are sent to draw water begin by drinking themselves, the
army is suffering from thirst.
31. If the enemy sees an advantage to be gained and makes no effort to
secure it, the soldiers are exhausted.
32. If birds gather on any spot, it is unoccupied. Clamour by night
betokens nervousness.
33. If there is disturbance in the camp, the general’s authority is weak. If
the banners and flags are shifted about, sedition is afoot. If the officers are
angry, it means that the men are weary.
34. When an army feeds its horses with grain and kills its cattle for food,
and when the men do not hang their cooking-pots over the camp-fires,
showing that they will not return to their tents, you may know that they are
determined to fight to the death.
35. The sight of men whispering together in small knots or speaking in
subdued tones points to disaffection amongst the rank and file.
36. Too frequent rewards signify that the enemy is at the end of his
resources; too many punishments betray a condition of dire distress.
37. To begin by bluster, but afterwards to take fright at the enemy’s
numbers, shows a supreme lack of intelligence.
38. When envoys are sent with compliments in their mouths, it is a sign
that the enemy wishes for a truce.
39. If the enemy’s troops march up angrily and remain facing ours for a
long time without either joining battle or taking themselves off again, the
situation is one that demands great vigilance and circumspection.
40. If our troops are no more in number than the enemy, that is amply
sufficient; it only means that no direct attack can be made. What we can do

is simply to concentrate all our available strength, keep a close watch on the
enemy, and obtain reinforcements.
41. He who exercises no forethought but makes light of his opponents is
sure to be captured by them.
42. If soldiers are punished before they have grown attached to you, they
will not prove submissive; and, unless submissive, then will be practically
useless. If, when the soldiers have become attached to you, punishments are
not enforced, they will still be useless.
43. Therefore soldiers must be treated in the first instance with humanity,
but kept under control by means of iron discipline. This is a certain road to
victory.
44. If in training soldiers commands are habitually enforced, the army
will be well-disciplined; if not, its discipline will be bad.
45. If a general shows confidence in his men but always insists on his
orders being obeyed, the gain will be mutual.

X. TERRAIN

1. Sun Tzŭ said: We may distinguish six kinds of terrain, to wit: (1)
Accessible ground; (2) entangling ground; (3) temporising ground; (4)
narrow passes; (5) precipitous heights; (6) positions at a great distance from
the enemy.
2. Ground which can be freely traversed by both sides is called
accessible.
3. With regard to ground of this nature, be before the enemy in occupying
the raised and sunny spots, and carefully guard your line of supplies. Then
you will be able to fight with advantage.
4. Ground which can be abandoned but is hard to re-occupy is called
entangling.
5. From a position of this sort, if the enemy is unprepared, you may sally
forth and defeat him. But if the enemy is prepared for your coming, and you
fail to defeat him, then, return being impossible, disaster will ensue.
6. When the position is such that neither side will gain by making the
first move, it is called temporising ground.
7. In a position of this sort, even though the enemy should offer us an
attractive bait, it will be advisable not to stir forth, but rather to retreat, thus
enticing the enemy in his turn; then, when part of his army has come out,
we may deliver our attack with advantage.
8. With regard to narrow passes, if you can occupy them first, let them be
strongly garrisoned and await the advent of the enemy.
9. Should the enemy forestall you in occupying a pass, do not go after
him if the pass is fully garrisoned, but only if it is weakly garrisoned.
10. With regard to precipitous heights, if you are beforehand with your
adversary, you should occupy the raised and sunny spots, and there wait for
him to come up.

11. If the enemy has occupied them before you, do not follow him, but
retreat and try to entice him away.
12. If you are situated at a great distance from the enemy, and the
strength of the two armies is equal, it is not easy to provoke a battle, and
fighting will be to your disadvantage.
13. These six are the principles connected with Earth. The general who
has attained a responsible post must be careful to study them.
14. Now an army is exposed to six several calamities, not arising from
natural causes, but from faults for which the general is responsible. These
are: (1) Flight; (2) insubordination; (3) collapse; (4) ruin; (5)
disorganisation; (6) rout.
15. Other conditions being equal, if one force is hurled against another
ten times its size, the result will be the flight of the former.
16. When the common soldiers are too strong and their officers too weak,
the result is insubordination. When the officers are too strong and the
common soldiers too weak, the result is collapse.
17. When the higher officers are angry and insubordinate, and on meeting
the enemy give battle on their own account from a feeling of resentment,
before the commander-in-chief can tell whether or no he is in a position to
fight, the result is ruin.
18. When the general is weak and without authority; when his orders are
not clear and distinct; when there are no fixed duties assigned to officers
and men, and the ranks are formed in a slovenly haphazard manner, the
result is utter disorganisation.
19. When a general, unable to estimate the enemy’s strength, allows an
inferior force to engage a larger one, or hurls a weak detachment against a
powerful one, and neglects to place picked soldiers in the front rank, the
result must be a rout.
20. These are six ways of courting defeat, which must be carefully noted
by the general who has attained a responsible post.
21. The natural formation of the country is the soldier’s best ally; but a
power of estimating the adversary, of controlling the forces of victory, and
of shrewdly calculating difficulties, dangers and distances, constitutes the
test of a great general.

22. He who knows these things, and in fighting puts his knowledge into
practice, will win his battles. He who knows them not, nor practises them,
will surely be defeated.
23. If fighting is sure to result in victory, then you must fight, even
though the ruler forbid it; if fighting will not result in victory, then you must
not fight even at the ruler’s bidding.
24. The general who advances without coveting fame and retreats
without fearing disgrace, whose only thought is to protect his country and
do good service for his sovereign, is the jewel of the kingdom.
25. Regard your soldiers as your children, and they will follow you into
the deepest valleys; look on them as your own beloved sons, and they will
stand by you even unto death.
26. If, however, you are indulgent, but unable to make your authority felt;
kind-hearted, but unable to enforce your commands; and incapable,
moreover, of quelling disorder: then your soldiers must be likened to spoilt
children; they are useless for any practical purpose.
27. If we know that our own men are in a condition to attack, but are
unaware that the enemy is not open to attack, we have gone only halfway
towards victory.
28. If we know that the enemy is open to attack, but are unaware that our
own men are not in a condition to attack, we have gone only halfway
towards victory.
29. If we know that the enemy is open to attack, and also know that our
men are in a condition to attack, but are unaware that the nature of the
ground makes fighting impracticable, we have still gone only halfway
towards victory.
30. Hence the experienced soldier, once in motion, is never bewildered;
once he has broken camp, he is never at a loss.
31. Hence the saying: If you know the enemy and know yourself, your
victory will not stand in doubt; if you know Heaven and know Earth, you
may make your victory complete.

XI. THE NINE SITUATIONS

1. Sun Tzŭ said: The art of war recognises nine varieties of ground: (1)
Dispersive ground; (2) facile ground; (3) contentious ground; (4) open
ground; (5) ground of intersecting highways; (6) serious ground; (7)
difficult ground; (8) hemmed-in ground; (9) desperate ground.
2. When a chieftain is fighting in his own territory, it is dispersive
ground.
3. When he has penetrated into hostile territory, but to no great distance,
it is facile ground.
4. Ground the possession of which imports great advantage to either side,
is contentious ground.
5. Ground on which each side has liberty of movement is open ground.
6. Ground which forms the key to three contiguous states, so that he who
occupies it first has most of the Empire at his command, is ground of
intersecting highways.
7. When an army has penetrated into the heart of a hostile country,
leaving a number of fortified cities in its rear, it is serious ground.
8. Mountain forests, rugged steeps, marshes and fens—all country that is
hard to traverse: this is difficult ground.
9. Ground which is reached through narrow gorges, and from which we
can only retire by tortuous paths, so that a small number of the enemy
would suffice to crush a large body of our men: this is hemmed in ground.
10. Ground on which we can only be saved from destruction by fighting
without delay, is desperate ground.
11. On dispersive ground, therefore, fight not. On facile ground, halt not.
On contentious ground, attack not.
12. On open ground, do not try to block the enemy’s way. On ground of
intersecting highways, join hands with your allies.

13. On serious ground, gather in plunder. In difficult ground, keep
steadily on the march.
14. On hemmed-in ground, resort to stratagem. On desperate ground,
fight.
15. Those who were called skilful leaders of old knew how to drive a
wedge between the enemy’s front and rear; to prevent co-operation between
his large and small divisions; to hinder the good troops from rescuing the
bad, the officers from rallying their men.
16. When the enemy’s men were scattered, they prevented them from
concentrating; even when their forces were united, they managed to keep
them in disorder.
17. When it was to their advantage, they made a forward move; when
otherwise, they stopped still.
18. If asked how to cope with a great host of the enemy in orderly array
and on the point of marching to the attack, I should say: “Begin by seizing
something which your opponent holds dear; then he will be amenable to
your will.”
19. Rapidity is the essence of war: take advantage of the enemy’s
unreadiness, make your way by unexpected routes, and attack unguarded
spots.
20. The following are the principles to be observed by an invading force:
The further you penetrate into a country, the greater will be the solidarity of
your troops, and thus the defenders will not prevail against you.
21. Make forays in fertile country in order to supply your army with
food.
22. Carefully study the well-being of your men, and do not overtax them.
Concentrate your energy and hoard your strength. Keep your army
continually on the move, and devise unfathomable plans.
23. Throw your soldiers into positions whence there is no escape, and
they will prefer death to flight. If they will face death, there is nothing they
may not achieve. Officers and men alike will put forth their uttermost
strength.
24. Soldiers when in desperate straits lose the sense of fear. If there is no
place of refuge, they will stand firm. If they are in the heart of a hostile

country, they will show a stubborn front. If there is no help for it, they will
fight hard.
25. Thus, without waiting to be marshalled, the soldiers will be
constantly on the qui vive; without waiting to be asked, they will do your
will; without restrictions, they will be faithful; without giving orders, they
can be trusted.
26. Prohibit the taking of omens, and do away with superstitious doubts.
Then, until death itself comes, no calamity need be feared.
27. If our soldiers are not overburdened with money, it is not because
they have a distaste for riches; if their lives are not unduly long, it is not
because they are disinclined to longevity.
28. On the day they are ordered out to battle, your soldiers may weep,
those sitting up bedewing their garments, and those lying down letting the
tears run down their cheeks. But let them once be brought to bay, and they
will display the courage of a Chu or a Kuei.
29. The skilful tactician may be likened to the shuai-jan. Now the shuai-
jan is a snake that is found in the Ch‘ang mountains. Strike at its head, and
you will be attacked by its tail; strike at its tail, and you will be attacked by
its head; strike at its middle, and you will be attacked by head and tail both.
30. Asked if an army can be made to imitate the shuai-jan, I should
answer, Yes. For the men of Wu and the men of Yüeh are enemies; yet if
they are crossing a river in the same boat and are caught by a storm, they
will come to each other’s assistance just as the left hand helps the right.
31. Hence it is not enough to put one’s trust in the tethering of horses,
and the burying of chariot wheels in the ground.
32. The principle on which to manage an army is to set up one standard
of courage which all must reach.
33. How to make the best of both strong and weak—that is a question
involving the proper use of ground.
34. Thus the skilful general conducts his army just as though he were
leading a single man, willy-nilly, by the hand.
35. It is the business of a general to be quiet and thus ensure secrecy;
upright and just, and thus maintain order.

36. He must be able to mystify his officers and men by false reports and
appearances, and thus keep them in total ignorance.
37. By altering his arrangements and changing his plans, he keeps the
enemy without definite knowledge. By shifting his camp and taking
circuitous routes, he prevents the enemy from anticipating his purpose.
38. At the critical moment, the leader of an army acts like one who has
climbed up a height and then kicks away the ladder behind him. He carries
his men deep into hostile territory before he shows his hand.
39. He burns his boats and breaks his cooking-pots; like a shepherd
driving a flock of sheep, he drives his men this way and that, and none
knows whither he is going.
40. To muster his host and bring it into danger:—this may be termed the
business of the general.
41. The different measures suited to the nine varieties of ground; the
expediency of aggressive or defensive tactics; and the fundamental laws of
human nature: these are things that must most certainly be studied.
42. When invading hostile territory, the general principle is, that
penetrating deeply brings cohesion; penetrating but a short way means
dispersion.
43. When you leave your own country behind, and take your army across
neighbourhood territory, you find yourself on critical ground. When there
are means of communication on all four sides, the ground is one of
intersecting highways.
44. When you penetrate deeply into a country, it is serious ground. When
you penetrate but a little way, it is facile ground.
45. When you have the enemy’s strongholds on your rear, and narrow
passes in front, it is hemmed-in ground. When there is no place of refuge at
all, it is desperate ground.
46. Therefore, on dispersive ground, I would inspire my men with unity
of purpose. On facile ground, I would see that there is close connection
between all parts of my army.
47. On contentious ground, I would hurry up my rear.
48. On open ground, I would keep a vigilant eye on my defences. On
ground of intersecting highways, I would consolidate my alliances.

49. On serious ground, I would try to ensure a continuous stream of
supplies. On difficult ground, I would keep pushing on along the road.
50. On hemmed-in ground, I would block any way of retreat. On
desperate ground, I would proclaim to my soldiers the hopelessness of
saving their lives.
51. For it is the soldier’s disposition to offer an obstinate resistance when
surrounded, to fight hard when he cannot help himself, and to obey
promptly when he has fallen into danger.
52. We cannot enter into alliance with neighbouring princes until we are
acquainted with their designs. We are not fit to lead an army on the march
unless we are familiar with the face of the country—its mountains and
forests, its pitfalls and precipices, its marshes and swamps. We shall be
unable to turn natural advantages to account unless we make use of local
guides.
53. To be ignorant 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.
55. Hence he does not strive to ally himself with all and sundry, nor does
he foster the power of other states. He carries out his own secret designs,
keeping his antagonists in awe. Thus he is able to capture their cities and
overthrow their kingdoms.
56. Bestow rewards without regard to rule, issue orders without regard to
previous arrangements; and you will be able to handle a whole army as
though you had to do with but a single man.
57. Confront your soldiers with the deed itself; never let them know your
design. When the outlook is bright, bring it before their eyes; but tell them
nothing when the situation is gloomy.
58. Place your army in deadly peril, and it will survive; plunge it into
desperate straits, and it will come off in safety.
59. For it is precisely when a force has fallen into harm’s way that is
capable of striking a blow for victory.
60. Success in warfare is gained by carefully accommodating ourselves
to the enemy’s purpose.

61. By persistently hanging on the enemy’s flank, we shall succeed in the
long run in killing the commander-in-chief.
62. This is called ability to accomplish a thing by sheer cunning.
63. On the day that you take up your command, block the frontier passes,
destroy the official tallies, and stop the passage of all emissaries.
64. Be stern in the council-chamber, so that you may control the
situation.
65. If the enemy leaves a door open, you must rush in.
66. Forestall your opponent by seizing what he holds dear, and subtly
contrive to time his arrival on the ground.
67. Walk in the path defined by rule, and accommodate yourself to the
enemy until you can fight a decisive battle.
68. At first, then, exhibit the coyness of a maiden, until the enemy gives
you an opening; afterwards emulate the rapidity of a running hare, and it
will be too late for the enemy to oppose you.

XII. THE ATTACK BY FIRE

1. Sun Tzŭ said: There are five ways of attacking with fire. The first is to
burn soldiers in their camp; the second is to burn stores; the third is to burn
baggage-trains; the fourth is to burn arsenals and magazines; the fifth is to
hurl dropping fire amongst the enemy.
2. In order to carry out an attack, we must have means available. The
material for raising fire should always be kept in readiness.
3. There is a proper season for making attacks with fire, and special days
for starting a conflagration.
4. The proper season is when the weather is very dry; the special days are
those when the moon is in the constellations of the Sieve, the Wall, the
Wing or the Cross-bar; for these four are all days of rising wind.
5. In attacking with fire, one should be prepared to meet five possible
developments:
6. (1) When fire breaks out inside the enemy’s camp, respond at once
with an attack from without.
7. (2) If there is an outbreak of fire, but the enemy’s soldiers remain
quiet, bide your time and do not attack.
8. (3) When the force of the flames has reached its height, follow it up
with an attack, if that is practicable; if not, stay where you are.
9. (4) If it is possible to make an assault with fire from without, do not
wait for it to break out within, but deliver your attack at a favourable
moment.
10. (5) When you start a fire, be to windward of it. Do not attack from the
leeward.
11. A wind that rises in the daytime lasts long, but a night breeze soon
falls.

12. In every army, the five developments connected with fire must be
known, the movements of the stars calculated, and a watch kept for the
proper days.
13. Hence those who use fire as an aid to the attack show intelligence;
those who use water as an aid to the attack gain an accession of strength.
14. By means of water, an enemy may be intercepted, but not robbed of
all his belongings.
15. Unhappy is the fate of one who tries to win his battles and succeed in
his attacks without cultivating the spirit of enterprise; for the result is waste
of time and general stagnation.
16. Hence the saying: The enlightened ruler lays his plans well ahead; the
good general cultivates his resources.
17. Move not unless you see an advantage; use not your troops unless
there is something to be gained; fight not unless the position is critical.
18. No ruler should put troops into the field merely to gratify his own
spleen; no general should fight a battle simply out of pique.
19. If it is to your advantage, make a forward move; if not, stay where
you are.
20. Anger may in time change to gladness; vexation may be succeeded by
content.
21. But a kingdom that has once been destroyed can never come again
into being; nor can the dead ever be brought back to life.
22. Hence the enlightened ruler is heedful, and the good general full of
caution. This is the way to keep a country at peace and an army intact.

XIII. THE USE OF SPIES

1. Sun Tzŭ said: Raising a host of a hundred thousand men and marching
them great distances entails heavy loss on the people and a drain on the
resources of the State. The daily expenditure will amount to a thousand
ounces of silver. There will be commotion at home and abroad, and men
will drop down exhausted on the highways. As many as seven hundred
thousand families will be impeded in their labor.
2. Hostile armies may face each other for years, striving for the victory
which is decided in a single day. This being so, to remain in ignorance of
the enemy’s condition simply because one grudges the outlay of a hundred
ounces of silver in honours and emoluments, is the height of inhumanity.
3. One who acts thus is no leader of men, no present help to his
sovereign, no master of victory.
4. Thus, what enables the wise sovereign and the good general to strike
and conquer, and achieve things beyond the reach of ordinary men, is
foreknowledge.
5. Now this foreknowledge cannot be elicited from spirits; it cannot be
obtained inductively from experience, nor by any deductive calculation.
6. Knowledge of the enemy’s dispositions can only be obtained from
other men.
7. Hence the use of spies, of whom there are five classes: (1) Local spies;
(2) inward spies; (3) converted spies; (4) doomed spies; (5) surviving spies.
8. When these five kinds of spy are all at work, none can discover the
secret system. This is called “divine manipulation of the threads.” It is the
sovereign’s most precious faculty.
9. Having local spies means employing the services of the inhabitants of
a district.
10. Having inward spies, making use of officials of the enemy.

11. Having converted spies, getting hold of the enemy’s spies and using
them for our own purposes.
12. Having doomed spies, doing certain things openly for purposes of
deception, and allowing our own spies to know of them and report them to
the enemy.
13. Surviving spies, finally, are those who bring back news from the
enemy’s camp.
14. Hence it is that with none in the whole army are more intimate
relations to be maintained than with spies. None should be more liberally
rewarded. In no other business should greater secrecy be preserved.
15. Spies cannot be usefully employed without a certain intuitive
sagacity.
16. They cannot be properly managed without benevolence and
straightforwardness.
17. Without subtle ingenuity of mind, one cannot make certain of the
truth of their reports.
18. Be subtle! be subtle! and use your spies for every kind of business.
19. If a secret piece of news is divulged by a spy before the time is ripe,
he must be put to death together with the man to whom the secret was told.
20. Whether the object be to crush an army, to storm a city, or to
assassinate an individual, it is always necessary to begin by finding out the
names of the attendants, the aides-de-camp, the door-keepers and sentries of
the general in command. Our spies must be commissioned to ascertain
these.
21. The enemy’s spies who have come to spy on us must be sought out,
tempted with bribes, led away and comfortably housed. Thus they will
become converted spies and available for our service.
22. It is through the information brought by the converted spy that we are
able to acquire and employ local and inward spies.
23. It is owing to his information, again, that we can cause the doomed
spy to carry false tidings to the enemy.
24. Lastly, it is by his information that the surviving spy can be used on
appointed occasions.

25. The end and aim of spying in all its five varieties is knowledge of the
enemy; and this knowledge can only be derived, in the first instance, from
the converted spy. Hence it is essential that the converted spy be treated
with the utmost liberality.
26. Of old, the rise of the Yin dynasty was due to I Chih who had served
under the Hsia. Likewise, the rise of the Chou dynasty was due to Lü Ya
who had served under the Yin.
27. Hence it is only the enlightened ruler and the wise general who will
use the highest intelligence of the army for purposes of spying and thereby
they achieve great results. Spies are a most important element in war,
because on them depends an army’s ability to move.

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