[Chang Yu attempts to explain the sequence of chapters as follows:
"Chapter IV, on Tactical Dispositions, treated of the offensive and the
defensive; chapter V, on Energy, dealt with direct and indirect
methods. The good general acquaints himself first with the theory of
attack and defence, and then turns his attention to direct and indirect
methods. He studies the art of varying and combining these two methods
before proceeding to the subject of weak and strong points. For the use
of direct or indirect methods arises out of attack and defence, and the
perception of weak and strong points depends again on the above
methods. Hence the present chapter comes immediately after the chapter
on Energy."]