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The Persians, led by their king had a unified command and strategic direction. The independent Greek city-states had their own motivations and self-protection competing with the push to unify. In the Persian invasion, the Persians use their fleet to threaten the cities which therefore kept their armies at home to defend their city. It was the agreement of the Greek cities to concentrate on destroying the Persian fleet (achieved at Salamis) which allowed the Greeks to bring out their armies, accept Spartan command, and present a unified army which won the land battle at Plataea and so ended the Persian invasion.

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8y ago

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