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.”
After such words of admonition, Brasidas began to withdraw his army. On seeing this the barbarians came on with a mighty shouting and uproar, thinking that he was fleeing and that they could overtake and destroy his army.
But the troops who had been selected to dash out met them wherever they charged, and Brasidas himself with his picked men sustained their attack; and so the Peloponnesians to their surprise withstood their first onset and continued to receive their attacks and repulse them, but when they ceased, themselves retired. Thereupon most of the barbarians refrained from attacking the Hellenes under Brasidas in the open country, and leaving a portion of their force to follow and harass them, the rest, advancing on the run after the fleeing Macedonians, slew them as they came upon them, and getting ahead of them occupied the narrow pass between two hills which led into the country of Arrhabaeus, knowing that there was no other way of retreat for Brasidas. And just as he was coming to the most difficult part of the road, they began to encircle him with a view to cutting him off.
But he perceived their intention and told his three hundred to break ranks and go at a run, each as fast as he could, to that one of the hills which he thought could be taken more easily and try to dislodge the barbarians already there before the larger outflanking body could come up.
They accordingly attacked and overcame the men on the hill, and so the main body of the Hellenes now more easily made their way to it; for the barbarians, finding that their own men had been dislodged from the high ground, became alarmed and followed no further, thinking that the enemy were already on the frontier and had made good their escape.
Brasidas, however, when he had gained the heights, proceeded in more security and arrived the same day at Arnisa, the first town in the dominions of Perdiccas.