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 to the battle, the Hellenes remembered the Dorians, an ethnic distinction which applied to the Spartans, as the conquerors and displacers of the Ionians in the Peloponnesus. After the battle, Spartan culture became an inspiration and object of emulation, a phenomenon known as Laconophilia. There are several analogous battles. Similarities between the Battle of Thermopylae and the Battle of Persian Gate have been recognized by both ancient and modern authors, which describe it as a kind of reversal of the Battle of Thermopylae, calling it "the Persian Thermopylae". Here, on Alexander the Great's campaign against Persia in 330 BC to