This was soon afterwards followed by the revolt of Euboea from Athens.
Pericles had already crossed over with an army of Athenians to the island, when news was brought to him that Megara had revolted, that the Peloponnesians were on the point of invading Attica, and that the Athenian garrison had been cut off by the Megarians, with the exception of a few who had taken refuge in Nisaea.
The Megarians had introduced the Corinthians, Sicyonians, and Epidaurians into the town before they revolted.
Meanwhile Pericles brought his army back in all haste from Euboea.
After this the Peloponnesians marched into Attica as far as Eleusis and Thrius, ravaging the country under the conduct of King Pleistoanax, the son of Pausanias, and without advancing further returned home.
The Athenians then crossed over again to Euboea under the command of Pericles, and subdued the whole of the island: all but Histiaea was settled by convention; the Histiaeans they expelled from their homes, and occupied their territory themselves.