The military career of Cato was not yet ended. In 191 BC, he, along with his old associate Lucius Valerius Flaccus, was appointed as a lieutenant-general (legatus)under the Consul Manius Acilius Glabrio, who had been dispatched to Greece to oppose the invasion of Antiochus III the Great, King of the Seleucid Empire. In the decisive Battle of Thermopylae (191 BC), which led to the downfall of Antiochus, Cato behaved with his usual valor, and enjoyed good fortune. By a daring and difficult advance, he surprised and removed a body of the enemy's Aetolian auxiliaries, who were posted upon the Callidromus, the highest peak of the range of Mount Oeta. Then, coming to the aid of forces under Flaccus's command, he began a sudden descent from the hills above the royal camp, and the panic caused by this unexpected movement promptly turned the day in favor of the Romans, and signaled the end of the Seleucid invasion of Greece. After the action, the consul hugged Cato with the greatest warmth and attributed to him the whole credit of the victory. That this is a fact rests on the authority of Cato himself, who, like Cicero, often indulged in the habit, offensive to modern taste, of sounding his own praises. After an interval spent in the pursuit of Antiochus and the pacification of Greece, Cato was sent to Rome by the Consul Glabrio to announce the successful outcome of the campaign, and he performed his journey with such celerity that he had started his report in the senate before the return of Lucius Cornelius Scipio, the later conqueror of Antiochus, who had been sent off from Greece a few days before him.