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 him at Thermopylae, forcing him to withdraw to Asia Minor. The Romans followed up their success by invading Anatolia, and the decisive victory of Scipio Asiaticus at Magnesia ad Sipylum (190 BC), following the defeat of Hannibal at sea off Side, delivered Asia Minor into their hands.