Expansion of Macedonia under Philip II a significant problem, blocking the main route into Greece. However, a second route into central Greece was available. In 480 BC, during the Battle of Thermopylae, the Persian king Xerxes had sent his army via a mountain track (the "Anopea") to outflank the pass. From this track, on the western side of Mount Kallidromon, another road led off and descended in Phocis. In 480 BC, a thousand Phocian troops were stationed above Thermopylae to guard the road and prevent a Persian assault on Phocis (though they notably failed to prevent the Persians using "Anopea"). However, in 339 BC, the Greeks
Battle of Thermopylae it set. Thermopylae is famous because of the heroism of the doomed rearguard, who, despite facing certain death, remained at the pass. Ever since, the events of Thermopylae have been the source of effusive praise from many sources: "...the fairest sister-victories which the Sun has ever seen, yet they would never dare to compare their combined glory with the glorious defeat of King Leonidas and his men." A second reason is the example it set of free men, fighting for their country and their freedom: So almost immediately, contemporary Greeks saw Thermopylae as a critical moral and culture lesson. In