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.

Astyochus had before this laid by the purpose of revenge against Alcibiades, especially when he was not in his own hands. And going to him to Magnesia and to Tissaphernes, related unto them what advertisement he had received from Samos, and made himself the appeacher. For he adhered, as was said, to Tissaphernes for his private lucre, both in this and in divers other matters;

which was also the cause that concerning the pay, when the abatement was made, he was not so stout in opposing it as he ought to have been.

Hereupon Alcibiades sendeth letters presently to those that were in office at Samos, accusing Phrynichus of what he had done and requiring to have him put to death. Phrynichus, perplexed with this discovery and brought into danger indeed, sends again to Astyochus, blaming what was past as not well concealed, and promised now to be ready to deliver unto him the whole army at Samos to be destroyed; writing from point to point (Samos being unwalled) in what manner he would do it, and saying that since his life was brought in danger, they could not blame him though he did this or any other thing rather than be destroyed by his most deadly enemies. This also Astyochus revealed unto Alcibiades.