In 191 BC , however , the Romans under Manius Acilius Glabrio routed him at Thermopylae , forcing him to withdraw to Asia Minor .
In 192 BC Antiochus invaded Greece with a 10,000 - man army , and was elected the commander in chief of the Aetolian League .
In 191 BC , however , the Romans under Manius Acilius Glabrio routed Antiochus at Thermopylae , forcing Antiochus to withdraw to Asia Minor .
In 192 BC Antiochus invaded Greece with a 10,000 - man army , and was elected the commander in chief of the Aetolian League .