The Decelean War was the final phase of the Peloponnesian War, lasting from 413 to 404 BCE, characterized by Spartan efforts to establish a permanent base at Decelea in Attica. This stage marked a significant shift in the conflict as Sparta received support from Persia, enabling them to challenge Athenian power more effectively. The establishment of a fortified position at Decelea disrupted Athenian resources and morale, ultimately leading to Athens' defeat and the end of the war.
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