History of the Peloponnesian War

Though they made this and many other statements besides, they listened none the more favourably, but were angry, and expressed different opinions, though most generally, that they should sail to the Piraeus. And on that occasion Alcibiades appeared to have benefited the state for the first time, and in a degree inferior to no one else. For when the Athenians at Samos were bent on sailing against their countrymen, in which case most certainly the enemy would have taken possession of Ionia and the Hellespont, he was the man who prevented them.

Indeed on that emergency no one else would have been able to restrain the multitude. He, however, both made them desist from the attack, and silenced with rebukes those individuals who were on their own account most angry with the ambassadors.

He then dismissed them with an answer from himself,

that he did not object to the Five Thousand being in power, but ordered them to depose the Four Hundred, and to establish the council of Five Hundred as before. That if any retrenchment had been made with a view to economy, in order that those who were on service might be better provided with supplies, he entirely approved of it.