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Pericles planned to avoid any major land battle with the superior Spartan army. Athenians stayed behind their walls and brought in supplies from their superior navy. They also attacked towns of the coastal Peloponnesian city-states.
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The Spartans find the countryside empty because Pericles had all Athenians come inside the city walls. They burned the fields and farm houses
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Athens and the Peloponnesian League - Sparta and its allies including Corinth and Thebes - are not friendly. Named for the Peloponnesus Mountains in the area.