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 (323 BC) 600 horsemen, while he left Sippas in command of Macedon. But the Thessalians, who initially supported Macedon, changed sides to the Athenian alliance and joined the Athenian general Leosthenes' forces in occupying the passes of Thermopylae, significantly outnumbering the Macedonians. Antipater was defeated in the ensuing battle and since he could not retreat because the Athenian coalitions' forces were stronger than his forces, he shut himself in the city of Lamia where he was subsequently besieged by Leosthenes' forces. Battle of Thermopylae (323 BC) The Battle of Thermopylae was fought in 323 BC between the Macedonians and a coalition of