History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
Now as for these Illyrians, for those who have had no experience of them, the menace of their attack has terror; for their number is indeed dreadful to behold and the loudness of their battle-cry is intolerable, and the idle brandishing of their arms has a threatening effect. But for hand to hand fighting, if their opponents but endure such threats, they are not the men they seem; for having no regular order, they would not be ashamed to abandon any position when hard pressed; and since flight and attack are considered equally honourable with them, their courage cannot be put to the test. Besides, a mode of fighting in which everyone is his own master will provide a man the best excuse for saving himself becomingly. They think, too, that it is a less risky game to try to frighten you from a safe distance than to meet you hand to hand;
otherwise they would not have taken this course in preference to that. And so you clearly see that all that was at first formidable about them is but little in reality, startling merely to eye and ear. If you withstand all this in the first onrush, and then, whenever opportunity offers, withdraw again in orderly array, you will the sooner reach safety, and will hereafter know that mobs like these, if an adversary but sustain their first onset, merely make a flourish of valour with threats from afar in menace[*](Possibly μελλήσει = “without coming to action.”) of attack, but if one yields to them, they are right upon his heels, quick enough to display their courage when all is safe.”