 Later in the 5th century BC, Sicyon, like Corinth, suffered from the commercial rivalry of Athens in the western seas, and was repeatedly harassed by squadrons of Athenian ships.The Sicyonians fought two battles against the Athenians, first against their admiral Tolmides in 455 BC and then in a land battle against Pericles with 1000 hoplites in 453 BC.In the Peloponnesian War Sicyon followed the lead of Sparta and Corinth.