The Art of War by active 6th century B.C. Sunzi

46. Therefore, on dispersive ground, I would inspire my men with unity

of purpose. [This end, according to Tu Mu, is best attained by remaining on the defensive, and avoiding battle. Cf. _supra_, § 11.] On facile ground, I would see that there is close connection between all parts of my army. [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. § 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."]