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Xerxes, Darius's successor, provoked the first signs of trouble for the Persian Empire when he tried to extend Achaemenid power into Europe by invading Greece. The disunited Greek city-states came together in face of the common threat and inflicted a stunning defeat on the huge Persian force, destroying its navy at the Battle of Salamis and its army at Plataea. Xerxes was forced to withdraw, and the Persians' formidable reputation was shattered; although their army would win later battles, there were no more attempts at territorial expansion.