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 (191 BC) the Aetolians were forced to sue for peace. The battle reaffirmed the advantage of Rome's flexible maniple system against the rigid Hellenic phalanx, especially in battles fought on broken ground or from multiple directions. The battle was described by Appian (included below) and by Livy 36.16-19. Appian's account: Battle of Thermopylae (191 BC) The Battle of Thermopylae was fought in 191 BC between a Roman army led by consul Manius Acilius Glabrio and a Seleucid force led by King Antiochus III the Great. It was the first major battle of the Roman–Seleucid War. The Romans were victorious, and as a