Thus the energy developed by good fighting men is as the momentum of a
round stone rolled down a mountain thousands of feet in height. So
much on the subject of energy.
The _T‘ung Tien_ omits 善. The chief lesson of this chapter, in Tu
Mu’s opinion, is the paramount importance in war of rapid
evolutions and sudden rushes. “Great results,” he adds, “can thus
be achieved with small forces.”