10. In battle, there are not more than two methods of attack—the direct and the indirect; yet these two in combination give rise to an endless series of manœuvers. 11. The direct and the indirect lead on to each other in turn. It is like moving in a circle—you never come to an end. Who can exhaust the possibilities of their combination? 12. The onset of troops is like the rush of a torrent which will even roll stones along in its course. 13. The quality of decision is like the well-timed swoop of a falcon which enables it to strike and destroy its victim. [The Chinese here is tricky and a certain key word in the context it is used defies the best efforts of the translator. Tu Mu defines this word as "the measurement or estimation of distance." But this meaning does not quite fit the illustrative simile in §. 15. Applying this definition to the falcon, it seems to me to denote that instinct of _self-restraint_ which keeps the bird from swooping on its quarry until the right moment, together with the power of judging when the right moment has arrived. The analogous quality in soldiers is the highly important one of being able to reserve their fire until the very instant at which it will be most effective. When the "Victory" went into action at Trafalgar at hardly more than drifting pace, she was for several minutes exposed to a storm of shot and shell before replying with a single gun. Nelson coolly waited until he was within close range, when the broadside he brought to bear worked fearful havoc on the enemy’s nearest ships.] 14. Therefore the good fighter will be terrible in his onset, and prompt in his decision. [The word "decision" would have reference to the measurement of distance mentioned above, letting the enemy get near before striking. But I cannot help thinking that Sun Tzŭ meant to use the word in a figurative sense comparable to our own idiom "short and sharp." Cf. Wang Hsi’s note, which after describing the falcon’s mode of attack, proceeds: "This is just how the ‘psychological moment’ should be seized in war."] 15. Energy may be likened to the bending of a crossbow; decision, to the releasing of the trigger. [None of the commentators seem to grasp the real point of the simile of energy and the force stored up in the bent cross-bow until released by the finger on the trigger.] 16. Amid the turmoil and tumult of battle, there may be seeming disorder and yet no real disorder at all; amid confusion and chaos, your array may be without head or tail, yet it will be proof against defeat. [Mei Yao-ch’en says: "The subdivisions of the army having been previously fixed, and the various signals agreed upon, the separating and joining, the dispersing and collecting which will take place in the course of a battle, may give the appearance of disorder when no real disorder is possible. Your formation may be without head or tail, your dispositions all topsy-turvy, and yet a rout of your forces quite out of the question."]