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.
Accordingly, picking out for himself one hundred and fifty hoplites and assigning the rest to Clearidas, he determined to make a sudden attack before the Athenians withdrew, thinking that he could not again cut them off thus isolated if once reinforcements should reach them. So calling together all the soldiers, wishing to encourage them and explain his plan, he spoke to them as follows:
“Men of the Peloponnesus, let it suffice to remind you briefly from what manner of country we have come, that it has ever been free because of its courage, and that you are going to fight, Dorians against Ionians, whom you have been accustomed to vanquish.
I will, however, explain to you in what way I intend to make the attack, in order that my plan of fighting in detachments and not in a body may not seem to anyone poor tactics and thus cause discouragement.
For I imagine that the enemy ascended the hill in contempt of us and because they could not have expected that anybody would come out for battle against them, and now, with broken ranks and intent upon reconnoitring, are taking small account of us.