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.
And so finally, when once they had been thrown into confusion, coming into collision with their own comrades in many different parts of the army, friends with friends and citizens with fellow-citizens, they not only became panic-stricken but came to blows with one another and were with difficulty separated.
And as they were being pursued by the enemy many hurled themselves down from the bluffs and perished; for the way down from Epipolae was narrow; and of those who in their attempt to escape got down to the level ground, the greater part, and especially those who belonged to the first expedition and therefore had a better acquaintance with the country, got through to the camp, but of those who had come later, some missed the roads and wandered about over the country, and these when day came were destroyed by the Syracusan cavalry, which were scouring the fields.