History of the Peloponnesian War

For this first armament that sailed for Sicily was the costliest and most splendid, belonging to a single city and with a purely Hellenic force, that had ever up to that time set sail. In number of ships, however, and of hoplites the expedition against Epidaurus under Pericles, and the same one afterwards under Hagnon against Potidaea, was not inferior; for in that voyage four thousand Athenian hoplites and three hundred knights and one hundred triremes had participated, and from Lesbos and Chios fifty triremes, and allied troops besides in large numbers.

But they had set off for a short voyage with a poor equipment; whereas this expedition, as one likely to be of long duration, was fitted out for both kinds of service, according as there might be need of either, with ships and also with land-forces.