History of the Peloponnesian War

Upon this Alcibiades instantly sent to the authorities at Samos a letter against Phrynichus, stating what he had done, and requiring that he should be put to death.

Phrynichus distracted, and placed in the utmost peril by the denunciation, sent again to Astyochus, reproaching him with having so ill kept the secret of his previous letter, and saying that he was now prepared to give them an opportunity of destroying the whole Athenian armament at Samos; giving a detailed account of the means which he should employ, Samos being unfortified, and pleading that being in danger of his life on their account, he could not now be blamed for doing this or anything else to escape being destroyed by his mortal enemies. This also Astyochus revealed to Alcibiades.

Meanwhile Phrynichus having had timely notice that he was playing him false, and that a letter on the subject was on the point of arriving from Alcibiades, himself anticipated the news, and told the army that the enemy, seeing that Samos was unfortified and the fleet not all stationed within the harbour, meant to attack the camp; that he could be certain of this intelligence, and that they must fortify Samos as quickly as possible, and generally look to their defences. It will be remembered that he was general, and had himself authority to carry out these measures.