Thermopylae
about 20,000 Persians and 4000 Greeks.
A few reasons, First, the Greeks had 7,000 men and the Persians had 15,000 Second, the Greeks fought the Persian Immortals which were histories most elite and powerful warriors. Third, the Persians found a route to outflank the Greeks.
They did not, the Persians won; the Greeks were WAAY outnumbered.
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Thermopylae
about 20,000 Persians and 4000 Greeks.
A few reasons, First, the Greeks had 7,000 men and the Persians had 15,000 Second, the Greeks fought the Persian Immortals which were histories most elite and powerful warriors. Third, the Persians found a route to outflank the Greeks.
Thermopylae was a small delaying action by a force from a dozen Greek city-states designed to force the invading Persians into a sea battle in the adjacent strait. When the sea battle was lost by the Greeks, the Thermopylae force was withdrawn/
They did not, the Persians won; the Greeks were WAAY outnumbered.
The Spartans and the Persians
The true answer is of course no.
Persians.
The Phoenicians were not anywhere near the Thermopylae Pass, so they could not betray the Greek force there.
The Spartans were the Greeks that lost to the Persians at the battle of Thermopylae
480 BC .
Thebans.