History of the Peloponnesian War
Thucydides
Thucydides. History of the Peloponnesian War. Crawley, Richard, translator. London and Toronto: J. M. Dent and Sons Ltd.; New York: E. P. Dutton and Co., 1914.
For by this time the ships had sailed round from Las, and anchoring at Epidaurus had overrun Aegina; and Theramenes asserted that, being bound for Euboea, they would never have sailed in to Lacedae and come back to anchor at Epidaurus, unless they had been invited to come to aid in the designs of which he had always accused the government. Further inaction had therefore now become impossible.
In the end, after a great many seditious harangues and suspicions, they set to work in real earnest. The heavy infantry in Piraeus building the wall in Eetionia, among whom was Aristocrates, a colonel, with his own tribe, laid hands upon Alexicles, a general under the oligarchy and the devoted adherent of the cabal, and took him into a house and confined him there.
In this they were assisted by one Hermon, commander of the Peripoli in Munychia, and others, and above all had with them the great bulk of the heavy infantry.
As soon as the news reached the Four Hundred, who happened to be sitting in the council chamber, all except the disaffected wished at once to go to the posts where the arms were, and menaced Theramenes and his party. Theramenes defended himself, and said that he was ready immediately to go and help to rescue Alexicles; and taking with him one of the generals belonging to his party, went down to Piraeus, followed by Aristarchus and some young men of the cavalry.
All was now panic and confusion. Those in the city imagined that Piraeus was already taken and the prisoner put to death, while those in Piraeus expected every moment to be attacked by the party in the city.