Orestes instantly returned to Rome; and the senate, preferring diplomacy to force, sent a second commission headed by Sext. Julius Cæsar, with instructions to use gentle language, and merely to demand the surrender of those who had instigated the violent scenes lately enacted at Corinth. A contemptuous answer was returned, upon which Cæsar returned to Rome, and the senate, roused at the Grecian insolence, declared war against the Achæans (147).
Metellus hoped to win the glory of pacifying Greece, as well as of conquering Macedonia. He sent some of his chief officers to endeavour to bring the Achæans to their senses. But their leaders were too far committed; and at the beginning of 146 B.C. Critolaus, a friend of Diæus, who was general for the year, advanced into Thessaly, and was joined by the Thebans, always the inveterate enemies of Rome. Metellus had already heard that the Achæan War was to be conducted by L. Mummius, one of the new consuls; and, anxious to bring it to a close before he was superseded, he advanced rapidly with his army. On this the braggart chiefs of the Achæans retreated in all haste, not endeavouring to make a stand even at Thermopylæ. Their army dispersed almost without a blow. Metellus pushed on straight towards the isthmus. Thebes he found deserted by her inhabitants; misery and desolation appeared everywhere.
Diæus prepared to defend Corinth. But popular terror had succeeded to popular passion; few citizens would enlist under his banner: though he emancipated a number of slaves, he could not muster more than fifteen thousand men.
When Metellus was almost within sight of Corinth, Mummius landed on the isthmus with his legions, and assumed the command. The Romans treated the enemy with so much contempt that one of their outposts was surprised; and Diæus, flushed with this small success, drew out his forces before the city. Mummius eagerly accepted the challenge, and the battle began. The Achæan cavalry fled at the first onset; the infantry was soon broken, and Diæus fled into one gate of Corinth and out of another without attempting further resistance. The Romans might have entered the city that same day; but seeing the strength of the Acropolis, and suspecting treachery, Mummius held back, and twenty-four hours elapsed before he took possession of his unresisting prey. But the city was treated as if it had been taken by assault; the men were put to the sword, the women and children reserved to be sold by auction. All treasures, all pictures, all the works of the famous artists who had moulded Corinthian brass into effigies of living force and symmetry, were seized by the consul on behalf of the state; then, at a given signal, fire was applied, and Corinth was reduced to a heap of ashes.
Mummius, a new man, was distinguished by the rudeness rather than by the simplicity of an Italian boor. He was not greedy, for he reserved little for himself; and when he died, his daughter found not enough left for her dowry; but his abstinence seems to have proceeded from indifference rather than self-denial. He cared not for the works of Grecian art. He suffered his soldiers to use one of the choicest works of the painter Aristides as a draught-board; but when Attalus offered him a large sum for the painting, he imagined it must be a talisman, and ordered it to be sent to Rome. Every one knows his speech to the seamen who contracted to carry the statues and pictures of Corinth to Rome. “If they lost or damaged them,” he said, “they must replace them with others of equal value.”
In the autumn ten commissioners arrived, as usual, with draughts of decrees for settling the future condition of Macedon and Greece. Polybius, who had returned from witnessing the conflagration of Carthage just in time to behold that of Corinth, had the melancholy satisfaction of being called to their counsels—a favour which he owed to the influence of Scipio. A wretched sycophant proposed to the commissioners to destroy the statues of Aratus and Philopœmen; but Polybius prevented this dishonour by showing that these eminent men had always endeavoured to keep peace with Rome. At the same time he declined to accept any part of the confiscated property of Diæus. Politically he was able to render important services. All Greece south of Macedonia and Epirus was formed into a Roman province under the name of Achaia.[62] The old republican governments of the various communities were abolished, and the constitution of each assimilated to that of the municipal cities of Italy. Polybius was left in Greece to settle these new constitutions, and to adjust them to the circumstances and wants of each place. His grateful countrymen raised a statue to his honour by the side of their old heroes, and placed an inscription on the pedestal, which declared that, if Greece had followed his advice, she would not have fallen.