History of the Peloponnesian War

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.

Accordingly they addressed themselves to the work of fortification, and Samos was thus fortified sooner than it would otherwise have been. Not long afterwards came the letter from Alcibiades, saying that the army was betrayed by Phrynichus, and the enemy about to attack it.

Alcibiades, however, gained no credit, it being thought that he was in the secret of the enemy's designs, and had tried to fasten them upon Phrynichus, and to make out that he was their accomplice, out of hatred; and consequently far from hurting him he rather bore witness to what he had said by this intelligence.