[As Tu Mu says, the object is to guard against two possible contingenc… — The Art of War
SAPIR 861
[As Tu Mu says, the object is to guard against two possible contingencies: "(1) the desertion of our own troops; (2) a sudden attack on the part of the enemy." Cf. VII. ss. 17. Mei Yao-ch`en says: "On the march, the regiments should be in close touch; in an encampment, there should be continuity between the fortifications."]
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