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The first Persian invasion.

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Darius I dies while making preparations for a new offensive against Greece.

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Xerxes, son of Darius I, becomes new Persian King.

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Greek city-states unite to face the Persians

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Land forces of  about 1,400-7,000 (different sources do not agree on the precise number) Greeks will be led by Leonidas.

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Leonidas chooses Thermopylae as the plain of battle.

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7000 Greek soldiers hold off the Persian army for 3 days.

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On the last day Leonidas orders other Greeks to withdraw and go back and warn city-states.  300 Spartans remain.

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300 Spartans die to the last man but they slow down the Persian military long enough for other Greek city states to prepare.