Battle of Plataea other. The Allies initially adopted a strategy of blocking land and sea approaches to southern Greece. Thus, in August 480 BC, after hearing of Xerxes' approach, a small Allied army led by Spartan King Leonidas I blocked the Pass of Thermopylae, while an Athenian-dominated navy sailed to the Straits of Artemisium. Famously, the massively outnumbered Greek army held Thermopylae for three days before being outflanked by the Persians, who used a little-known mountain path. Although much of the Greek army retreated, the rearguard, formed of the Spartan and Thespian contingents, was surrounded and annihilated. The simultaneous Battle of Artemisium, consisting
History of Macedonia (ancient kingdom) Argos, necessitating Roman intervention and a peace settlement with the Spartans, yet the Romans finally evacuated Greece in the spring of 194 BC. Encouraged by the Aetolian League and their calls to liberate Greece from the Romans, the Seleucid king Antiochus III landed with his army at Demetrias, Thessaly in 192 BC, and was elected "strategos" by the Aetolians. However, Philip V of Macedon maintained his alliance with the Romans, along with the Achaean League, Rhodes, Pergamon, and Athens. The Romans defeated the Seleucids in the 191 BC Battle of Thermopylae as well as the Battle of Magnesia in 190