Xerxes was heir to Darius. What 'advice about him' means in this
context I can't fathom.
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After being defeated in the battle, the remnant of the Persian
army led by Mardonius retreated to its base in Asia Minor to
regroup and there face the revolts of the Greek city-states
there.
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The Persians were defeated by the Athenian Admiral Themistocles
at the sea battle of Salamis and the Spartan general Pausanius
defeated the Persian army led by Mardonius at the battle of Plataea
.