History of the Peloponnesian War

He sends secret letters to Astyochus, the Lacedaemonian general, who was yet about Miletus, and advertised him that Alcibiades undid their affairs and was procuring the friendship of Tissaphernes for the Athenians, writing in plain terms the whole business and desiring to be excused if he rendered evil to his enemy with some disadvantage to his country.