History of the Peloponnesian War

The Athenians were now all in Corcyra, both they and their confederates. And first the generals took a view of the whole army and put them into the order wherein they were to anchor and make their naval camp; and having divided them into three squadrons, to each squadron they assigned a captain by lot, to the end that being at sea they might not come into want of water or harbours or any other necessaries where they chanced to stay; and that they might otherwise be the more easy to be governed when every squadron had his proper commander.

After this they sent before them three galleys into Italy and Sicily to bring them word what cities in those parts would receive them, whom they appointed to come back and meet them that they might know whether they might be received or not before they put in.