History of the Peloponnesian War

The Lacedaemonians first received the news of the fleet having put out from the Isthmus, Alcamenes having been ordered by the Ephors to send off a horseman when this took place, and immediately resolved to despatch their own five vessels under Chalcideus, and Alcibiades with him. But while they were full of this resolution came the second news of the fleet having taken refuge in Spiraeum; and disheartened at their first step in the Ionian war proving a failure, they laid aside the idea of sending the ships from their own country, and even wished to recall some that had already sailed.

Perceiving this, Alcibiades again persuaded Endius and the other Ephors to persevere in the expedition, saying that the voyage would be made before the Chians heard of the fleet's misfortune, and that as soon as he set foot in Ionia, he should, by assuring them of the weakness of the Athenians and the zeal of Lacedaemon, have no difficulty in persuading the cities to revolt, as they would readily believe his testimony.

He also represented to Endius himself in private that it would be glorious for him to be the means of making Ionia revolt and the king become the ally of Lacedaemon, instead of that honour being left to Agis