This was a series of conflicts between several Greek city-states and the Persian Empire. They started in 499 BC and lasted until 448 BC. There were
two invasions of the Greek mainland, one in 490 BC (under Darius) and
another in 480 BC (under Xerxes). In both cases the allied Greeks successfully
repelled them

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explanation:

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c. troops marched forward in close formation against newer, more accurate weapons

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