• Megara v. Corinth
o Megara defected from the Peloponnesian League to the Delian League. Megara was on the land bridge, and had a very important port. Corinth was upset by this, because it would put Athenian/Megaran shipping in competition with Corinthian interests.
o Spartans refused to do anything
o Helot rebellion on Mt. Ithome, results in the helots surrendering under the condition that they get to leave and live somewhere else
• Athenians settle them in Naupactus, which is at the mouth of the gulf that Corinth is in. This made Corinth even more upset, because it gave Athens even greater control over Corinth's trading routes.
o Corinth and Aegina combined, and they together fought the Athenians, and lost.
• Athenians build long walls, which make them unsiegible, to the port of Piraeus.
o Cimon gets cocky, goes to Egypt, but fails.
o Cimon negotiates a 5-year peace between Athens with Persian and Sparta, because Athens needed to refocus on maintaining its control of the Aegean.