[Wang Hsi explains the name by saying that "when an army has reached such a point, its situation is serious."]
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ClearWhen an army has penetrated into the heart of a hostile country, leaving a number of fortified cities in its rear, it is serious ground.
[The belligerent who holds this dominating position can constrain most of them to become his allies.]
so that he who occupies it first has most of the Empire at his command,
[Ts’au Kung defines this as: "Our country adjoining the enemy’s and a third country conterminous with both." Meng Shih instances the small principality of Cheng, which was bounded on the north-east by Ch’i, on the west by Chin, and on the south by Ch’u.]
Ground which forms the key to three contiguous states,
[There are various interpretations of the Chinese adjective for this type of ground. Ts’ao Kung says it means "ground covered with a network of roads," like a chessboard. Ho Shih suggested: "ground on which intercommunication is easy."]
Ground on which each side has liberty of movement is open ground.
[Tu Mu defines the ground as ground "to be contended for." Ts’ao Kung says: "ground on which the few and the weak can defeat the many and the strong," such as "the neck of a pass," instanced by Li Ch’uan. Thus, Thermopylae was of this classification because the possession of it, even for a few days only, meant holding the entire invading army in check and thus gaining invaluable time. Cf. Wu Tzŭ, ch. V. ad init.: "For those who have to fight in the ratio of one to ten, there is nothing better than a narrow pass." When Lu Kuang was returning from his triumphant expedition to Turkestan in 385 A.D., and had got as far as I-ho, laden with spoils, Liang Hsi, administrator of Liang-chou, taking advantage of the death of Fu Chien, King of Ch’in, plotted against him and was for barring his way into the province. Yang Han, governor of Kao-ch’ang, counseled him, saying: "Lu Kuang is fresh from his victories in the west, and his soldiers are vigorous and mettlesome. If we oppose him in the shifting sands of the desert, we shall be no match for him, and we must therefore try a different plan. Let us hasten to occupy the defile at the mouth of the Kao-wu pass, thus cutting him off from supplies of water, and when his troops are prostrated with thirst, we can dictate our own terms without moving. Or if you think that the pass I mention is too far off, we could make a stand against him at the I-wu pass, which is nearer. The cunning and resource of Tzŭ-fang himself would be expended in vain against the enormous strength of these two positions." Liang Hsi, refusing to act on this advice, was overwhelmed and swept away by the invader.]
Ground the possession of which imports great advantage to either side, is contentious ground.
[Li Ch’uan and Ho Shih say "because of the facility for retreating," and the other commentators give similar explanations. Tu Mu remarks: "When your army has crossed the border, you should burn your boats and bridges, in order to make it clear to everybody that you have no hankering after home."]
When he has penetrated into hostile territory, but to no great distance, it is facile ground.
[So called because the soldiers, being near to their homes and anxious to see their wives and children, are likely to seize the opportunity afforded by a battle and scatter in every direction. "In their advance," observes Tu Mu, "they will lack the valor of desperation, and when they retreat, they will find harbors of refuge."]
When a chieftain is fighting in his own territory, it is dispersive ground.
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.
The Art of War — Chapter 12: Chapter 10: The Nine Situations (part 1/2)
[Li Ch’uan sums up as follows: "Given a knowledge of three things—the affairs of men, the seasons of heaven and the natural advantages of earth—, victory will invariably crown your battles."]
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.
[The reason being, according to Tu Mu, that he has taken his measures so thoroughly as to ensure victory beforehand. "He does not move recklessly," says Chang Yu, "so that when he does move, he makes no mistakes."]
Hence the experienced soldier, once in motion, is never bewildered; once he has broken camp, he is never at a loss.