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
Thermopylae Thermopylae Thermopylae (; Ancient Greek and Katharevousa: ("Thermopylai") , Demotic Greek (Greek): , ("Thermopyles") ; "hot gates") is a place in Greece where a narrow coastal passage existed in antiquity. It derives its name from its hot sulphur springs. The Hot Gates is "the place of hot springs" and in Greek mythology it is the cavernous entrances to Hades". Thermopylae is world-famous for the battle that took place there between the Greek forces (notably the Spartans) and the invading Persian forces, commemorated by Simonides in the famous epitaph, "Go tell the Spartans, stranger passing by, That here obedient to their