History of the Peloponnesian War

Now Phrynichus, knowing that an overture was to be made at Athens for the restoring of Alcibiades and that the Athenians would embrace it, and fearing lest being recalled he should do him a mischief (in regard he had spoken against it) as one that would have hindered the same, betook himself to this course:

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.