History of the Peloponnesian War

Now these men present indeed a demonstration fearful to such as are unacquainted with them: for they are formidable in their numbers which meet the eye, and intolerable from the loudness of their shouting; and the brandishing of their weapons in the air has a look of threatening. But to those who stand their ground against them, they are not what they seemed; for they have no definite order, so as to be ashamed of leaving any particular position, when hard pressed; and their retreat and attack being considered equally honourable puts their courage also beyond the reach of proof; while their independent mode of fighting would most frequently afford a man a pretext for saving himself with a fair show. And so they consider the probability of their frightening you without any danger to themselves a surer game than meeting you hand to hand; else they would have adopted that method instead of their present one.

And in this way you clearly see, that all that was previously terrible in them, is but little in reality, though to the eye and to the ear very urgent. If, therefore, you stand firm against its approach, and when you have an opportunity, again retire in good order, and in your ranks, you will the sooner reach a place of safety; and will know in future, that to those who sustain their first attack, such rabbles only make a vaunting demonstration, by threatening at a distance; but in the case of those who yield to them, they are quick in displaying their courage in pursuit, when they can do it with security.