[Wei Liao Tzŭ (ch. 4) says: "If the commander gives his orders with decision, the soldiers will not wait to hear them twice; if his moves are made without vacillation, the soldiers will not be in two minds about doing their duty." General Baden-Powell says, italicizing the words: "The secret of getting successful work out of your trained men lies in one nutshell—in the clearness of the instructions they receive." [3] Cf. also Wu Tzŭ ch. 3: "the most fatal defect in a military leader is difference; the worst calamities that befall an army arise from hesitation."] when there are no fixed duties assigned to officers and men, [Tu Mu says: "Neither officers nor men have any regular routine."] and the ranks are formed in a slovenly haphazard manner, the result is utter _disorganisation_. 19. When a general, unable to estimate the enemy’s strength, allows an inferior force to engage a larger one, or hurls a weak detachment against a powerful one, and neglects to place picked soldiers in the front rank, the result must be a _rout_. [Chang Yu paraphrases the latter part of the sentence and continues: "Whenever there is fighting to be done, the keenest spirits should be appointed to serve in the front ranks, both in order to strengthen the resolution of our own men and to demoralize the enemy." Cf. the primi ordines of Caesar ("De Bello Gallico," V. 28, 44, et al.).] 20. These are six ways of courting defeat, which must be carefully noted by the general who has attained a responsible post. [See _supra_, § 13.] 21. The natural formation of the country is the soldier’s best ally; [Ch’en Hao says: "The advantages of weather and season are not equal to those connected with ground."] but a power of estimating the adversary, of controlling the forces of victory, and of shrewdly calculating difficulties, dangers and distances, constitutes the test of a great general. 22. He who knows these things, and in fighting puts his knowledge into practice, will win his battles. He who knows them not, nor practises them, will surely be defeated. 23. If fighting is sure to result in victory, then you must fight, even though the ruler forbid it; if fighting will not result in victory, then you must not fight even at the ruler’s bidding.