[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 Tzu, 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 Tzu-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.]
5. Ground on which each side has liberty of movement is open ground.
[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."]
6. Ground which forms the key to three contiguous states,[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.]
so that he who occupies it first has most of the Empire at his command,[The belligerent who holds this dominating position can constrain most of them to become his allies.]
is a 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.
[Wang Hsi explains the name by saying that "when an army has reached such a point, its situation is serious."]
8. Mountain forests,[Or simply "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.
[The situation, as pictured by Ts`ao Kung, is very similar to the "hemmed-in ground" except that here escape is no longer possible: "A lofty mountain in front, a large river behind, advance impossible, retreat blocked." Ch`en Hao says: "to be on 'desperate ground' is like sitting in a leaking boat or crouching in a burning house." Tu Mu quotes from Li Ching a vivid description of the plight of an army thus entrapped: "Suppose an army invading hostile territory without the aid of local guides:
-- it falls into a fatal snare and is at the enemy's mercy. Aravine on the left, a mountain on the right, a pathway so perilous that the horses have to be roped together and the chariots carried in slings, no passage open in front, retreat cut off behind, no choice but to proceed in single file. Then, before there is time to range our soldiers in order of battle, the enemy is overwhelming strength suddenly appears on the scene.
Advancing, we can nowhere take a breathing-space; retreating, we have no haven of refuge. We seek a pitched battle, but in vain;yet standing on the defensive, none of us has a moment's respite.
If we simply maintain our ground, whole days and months will crawl by; the moment we make a move, we have to sustain the enemy's attacks on front and rear. The country is wild, destitute of water and plants; the army is lacking in the necessaries of life, the horses are jaded and the men worn-out, all the resources of strength and skill unavailing, the pass so narrow that a single man defending it can check the onset of ten thousand; all means of offense in the hands of the enemy, all points of vantage already forfeited by ourselves:--in this terrible plight, even though we had the most valiant soldiers and the keenest of weapons, how could they be employed with the slightest effect?" Students of Greek history may be reminded of the awful close to the Sicilian expedition, and the agony of the Athenians under Nicias and Demonsthenes. [See Thucydides, VII.
78 sqq.].]
11. On dispersive ground, therefore, fight not. On facile ground, halt not. On contentious ground, attack not.
