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.
Many are the proofs which we have given of our power and assuredly it does not lack witnesses, and therefore we shall be the wonder not only of the men of to-day but of after times; we shall need no Homer to sing our praise nor any other poet whose verses may perhaps delight for the moment but whose presentation of the facts will be discredited by the truth. Nay, we have compelled every sea and every land to grant access to our daring, and have everywhere planted everlasting memorials both of evil to foes and of good to friends.
Such, then, is the city for which these men nobly fought and died, deeming it their duty not to let her be taken from them; and it is fitting that every man who is left behind should suffer willingly for her sake.