History of the Peloponnesian War

After the affair at Plataea the treaty had been broken by an overt act, and Athens at once prepared for war, as did also Lacedaemon and her allies. They resolved to send embassies to the king and to such other of the barbarian powers as either party could look to for assistance, and tried to ally themselves with the independent states at home.

Lacedaemon, in addition to the existing marine, gave orders to the states that had declared for her in Italy and Sicily to build vessels up to a grand total of five hundred, the quota of each city being determined by its size, and also to provide a specified sum of money. Till these were ready they were to remain neutral and to admit single Athenian ships into their harbors.

Athens on her part reviewed her existing confederacy, and sent embassies to the places more immediately round Peloponnese, Corcyra, Cephallenia, Acarnania, and Zacynthus; perceiving that if these could be relied on she could carry the war all round Peloponnese.