Now Phrynichus was well aware of his treachery, and he knew that another letter from Alcibiades1
giving further information was on the point of arriving. Before its arrival he himself warned the army that, Samos being unwalled and some of the ships not anchoring within the harbour, the enemy were going to attack the fleet; of this he had certain knowledge. They ought therefore to fortify the place as quickly as they could, and to take every precaution. As he was a general he could execute his proposals by his own authority.
So they set to work, and in consequence Samos, which would have been fortified in any case, was fortified all the sooner. Not long afterwards the expected letter came from Alcibiades warning the Athenians that the army was being betrayed by Phrynichus, and that the enemy were going to make an attack.
But Alcibiades was not trusted; he was thought to have attributed to Phrynichus out of personal animosity complicity in the enemy's designs, with which he was himself acquainted. Thus he did him no harm, but rather strengthened his position by telling the same tale.