The Decelean War was the final phase of the Peloponnesian War, taking place from 413 to 404 BCE, marked by the significant conflict between Athens and Sparta. It is notable for Sparta establishing a permanent military outpost at Decelea in Attica, which hindered Athenian resources and morale, ultimately leading to Athens' downfall. This war exemplified the broader contrasts and conflicts between the democratic ideals of Athens and the oligarchic values of Sparta, highlighting the intense rivalry that characterized their relationship.
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