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.
He so stationed the youngest of his troops that they might dash out against the enemy, in case they attacked at any point, and proposed to take himself three hundred picked men and, bringing up the rear, to make a stand and beat off the foremost of the enemy whenever they pressed him hard.
And before the enemy were near he exhorted his soldiers, so far as haste allowed, in the following words:
“Did I not suspect, men of Peloponnesus, that you are in a state of panic because you have been left alone, and because your assailants are barbarous and numerous, I should not offer you instruction combined with encouragement. But as it is, in view of our abandonment by our allies and of the multitude of our opponents, I shall try by a brief reminder and by advice to impress upon you the most important considerations.