Meantime Mummius, and with him Orestes, who was first sent from Rome to settle the disputes between the Lacedæmonians and Achæans, reached the Roman army one morning, took over the command, and sent Metellus and his forces back to Macedonia, and himself waited at the Isthmus till he had concentrated all his forces. His cavalry amounted to 3,500, his infantry to 22,000. There were also some Cretan bowmen, and Philopœmen had brought some soldiers from Attalus, from Pergamus across the Caicus. Mummius placed some of the Italian troops and allies, so as to be an advanced post for all his army, 12 stades in the van. And the Achæans, as this vanguard was left without defence through the confidence of the Romans, attacked them, and slew some, but drove still more back to the camp, and captured about 500 shields. By this success the Achæans were so elated that they attacked the Roman army without waiting for them to begin the battle. But when Mummius led out his army to battle in turn, then the Achæan cavalry, which was opposite the Roman cavalry, ran immediately, not venturing to make one stand against the attack of the enemy’s cavalry. And the infantry, though dejected at the rout of the cavalry, stood their ground against the wedge-like attack of the Roman infantry, and though outnumbered and fainting under their wounds, yet resisted bravely, till 1,000 picked men of the Romans took them in flank, and so turned the battle into a complete rout of the Achæans. And had Diæus been bold enough to hurry into Corinth after the battle, and receive within its walls the runaways from the fight and shut himself up there, the Achæans might have obtained better terms from Mummius, if the war had been lengthened out by a siege. But as it was, directly the Achæans gave way before the Romans, Diæus fled for Megalopolis, exhibiting to the Achæans none of that spirit which Callistratus, the son of Empedus, had displayed to the Athenians. For he being in command of the cavalry in Sicily, when the Athenians and their allies were badly defeated at the river Asinarus, boldly cut his way through the enemy at the head of the cavalry, and, after getting safe through with most of them to Catana, turned back again on the road to Syracuse, and finding the enemy still plundering the camp of the Athenians killed five with his own hand and then expired, himself and his horse having received fatal wounds. He won fair fame both for the Athenians and himself, and voluntarily met death, having preserved the cavalry whom he led. But Diæus after ruining the Achæans announced to the people of Megalopolis their impending ruin, and after slaying his wife with his own hand that she might not become a captive took poison and so died, resembling Menalcidas as in his greed for money so also in the cowardice of his death.