Thus the skilful general conducts his army just as though he were
leading a single man, willy-nilly, by the hand.
Tu Mu says: 喩易也 “The simile has reference to the ease with which
he does it.” 不得已 means that he makes it impossible for his
troops to do otherwise than obey. Chang Yü quotes a jingle, to be
found in Wu Tzŭ, ch. 4: 將之所揮，莫不從移，將之所指，莫不前死.