History of the Peloponnesian War

In the mean time the Isthmian games were being celebrated, and the Athenians (the sacred truce having been proclaimed) went to attend them; and thus the designs of the Chians became more evident to them. When they returned, they immediately took measures that the fleet might not put out from Cenchrea unobserved by them.

After the festival the Peloponnesians set sail for Chios with one and twenty ships under the command of Alcamenes; and the Athenians, having at first advanced against them with an equal number, then began to retreat towards the open sea. When the enemy did not follow them far, but drew back, the Athenians likewise returned; for they had the seven Chian vessels in the number of those with them, and did not consider them trustworthy.