12. 交地則無絶衢地則合交
On open ground, do not try to block the enemy’s way.
Because the attempt would be futile, and would expose the blocking force itself to serious risks. There are two interpretations of 無絶. I follow that of Chang Yü (不可以兵阻絶其路). The other is indicated in Ts‘ao Kung’s brief note: 相及屬也 “Draw closer together”—i.e., see that a portion of your own army is not cut off. Wang Hsi points out that 交地 is only another name for the 通地 “accessible ground” of X. § 2, and says that the advice here given is simply a variation of 利糧道 “keep a sharp eye on the line of supplies,” be careful that your communications are not cut. The T‘ung Tien reads 無相絶.
On ground of intersecting highways, join hands with your allies.
Or perhaps, “form alliances with neighbouring states.” Thus Ts‘ao Kung has: 結諸侯也. Capt. Calthrop’s “cultivate intercourse” is much too timid and vague. The original text reads 交合.
13. 重地則掠圮地則行
On serious ground, gather in plunder.
On this, Li Ch‘üan has the following delicious note: 深入敵境不可 非義失人心如漢高祖入秦無犯婦女無取寳貨得人心也此筌以掠字爲無掠字 “When an army penetrates far into the enemy’s country, care must be taken not to alienate the people by unjust treatment. Follow the example of the Han Emperor Kao Tsu, whose march into Ch‘in territory was marked by no violation of women or looting of valuables. [Nota bene: this was in 207 B.C., and may well cause us to blush for the Christian armies that entered Peking in 1900 A.D.] Thus he won the hearts of all. In the present passage, then, I think that the true reading must be, not 掠 ‘plunder’, but 無掠 ‘do not plunder’.” Alas, I fear that in this instance the worthy commentator’s feelings outran his judgment. Tu Mu, at least, has no such illusions. He says: “When encamped on ‘serious ground,’ there being no inducement as yet to advance further, and no possibility of retreat, one ought to take measures for a protracted resistance by bringing in provisions from all sides, and keep a close watch on the enemy.” Cf. also II. § 9: 因糧於敵.
In difficult ground, keep steadily on the march.
Or, in the words of VIII. §2, 無舍 “do not encamp.”
14. 圍地則謀死地則戰
On hemmed-in ground, resort to stratagem.
Ts‘ao Kung says: 發奇謀 “Try the effect of some unusual artifice;” and Tu Yu amplifies this by saying: 居此則當權謀詐譎可以免難 “In such a position, some scheme must be devised which will suit the circumstances, and if we can succeed in deluding the enemy, the peril may be escaped.” This is exactly what happened on the famous occasion when Hannibal was hemmed in among the mountains on the road to Casilinum, and to all appearances entrapped by the Dictator Fabius. The stratagem which Hannibal devised to baffle his foes was remarkably like that which T‘ien Tan had also employed with success exactly 62 years before. [See IX. § 24, note.] When night came on, bundles of twigs were fastened to the horns of some 2000 oxen and set on fire, the terrified animals being then quickly driven along the mountain side towards the passes which were beset by the enemy. The strange spectacle of these rapidly moving lights so alarmed and discomfited the Romans that they withdrew from their position, and Hannibal’s army passed safely through the defile. [See Polybius, III. 93, 94; Livy, XXII. 16, 17.]
On desperate ground, fight.
For, as Chia Lin remarks: 力戰或生守隅則死 “if you fight with all your might, there is a chance of life; whereas death is certain if you cling to your corner.”
15. 所謂古之善用兵者能使敵人前後不相及衆寡不相恃貴賤不相救上下不相扶
Those who were called skilful leaders of old
所謂 is omitted in the T‘u Shu text.
knew how to drive a wedge between the enemy’s front and rear;
More literally, “cause the front and rear to lose touch with each other.”
to prevent co-operation between his large and small divisions; to hinder the good troops from rescuing the bad,
I doubt if 貴賤 can mean “officers and men,” as Capt. Calthrop translates. This is wanted for 上下.
the officers from rallying their men.
The reading 扶, derived from the Yü Lan, must be considered very doubtful. The original text has 救, and the T‘u Shu 收.
16. 卒離而不集兵合而不齊
When the enemy’s men were scattered, they prevented them from concentrating;
Capt. Calthrop translates 卒離 “they scattered the enemy,” which cannot be right.
even when their forces were united, they managed to keep them in disorder.
Sun Tzŭ on the Art of War: the Oldest Military Treatise in the World · The Wunder Library — complete classics, free to read, with narration.