Leonidas I
Battle of Thermopylae
Whatever the reason Sparta's own contribution was just 300 Spartiates (accompanied by their attendants and probably perioikoi auxiliaries), the total force assembled for the defense of the pass of Thermopylae came to something between four and seven thousand Greeks. They faced a Persian army who had invaded from the north of Greece under Xerxes I. Herodotus stated that this army consisted of over two million men; modern scholars consider this to be an exaggeration and give estimates ranging from 70,000 to 300,000.
Leonidas I-10