Their infantry soldiers were armoured, whereas the Persians just had wicker shields.
Their supply line was short, whereas the Persians were supplied by ship from Asia Minor - when the Persian war fleet was crippled at Salamis, they had to send half their army home as they could not be fed during the oncoming winter.
Much of the credit goes to the Greek navy which won the majority of sea-land battles, which kept the Persians on the defensive and brought them to agree to a peace after 50 years of fighting.
Superior strategy, superior tactics, greater tenacity as they were fighting for their home cities' independence.
The Persian war ended Persian expansion to the west. Thermopylae was a minor tactical delaying action which failed.
They were armoured and they were holding a narrow pass 100 metres wide at its narrowest.
The invading Persian army.
Wicker.
The Battle of Thermopylae took place in the second of the two Persian Wars, also known more recently as the Greco-Persian Wars.
None. The Greek force at Thermopylae comprised about 8,000 from a dozen city states, including Sparta which provided 300 armoured warriors and 2,100 light infantry.
King Xerxes I.
Thermopylai was a battle in the Persian War.
It was the Battle of Thermopylae in the Second Persian War. The Greeks won. Shortly after Thermopylae the Athenian Navy defeated the Persian Navy at Salamis, and in the next year the Persian Army was defeated by a combined Greek Army at Plataea.
The answer is the Persian war.
Thermopylae , Greece
Five thousand Persian archers.