The war was now confined to Sicily; but, since the defeat of Regulus, the Roman soldiers had been so greatly alarmed by the elephants, that their generals did not venture to attack the Carthaginians. At length, in B.C. 250, the Roman proconsul, L. Metellus, accepted battle under the walls of Panormus, and gained a decisive victory. The Carthaginians lost 20,000 men; 13 of their generals adorned the triumph of Metellus; and 104 elephants were also led in the triumphal procession. This was the most important battle that had been yet fought in Sicily, and had a decisive influence upon the issue of the contest. It so raised the spirits of the Romans that they determined once more to build a fleet of 200 sail. The Carthaginians, on the other hand, were anxious to bring the war to an end, and accordingly sent an embassy to Rome to propose an exchange of prisoners, and to offer terms of peace. Regulus, who had been now five years in captivity, was allowed to accompany the embassadors, with the promise that he would return to Carthage if their proposals were declined. This embassy is the subject of one of the most celebrated stories in the Roman annals. The orators and poets relate how Regulus at first refused to enter the city as a slave of the Carthaginians; how afterward he would not give his opinion in the Senate, as he had ceased by his captivity to be a member of that illustrious body; how, at length, when induced by his countrymen to speak, he endeavored to dissuade the Senate from assenting to a peace, or even to an exchange of prisoners; and when he saw them wavering, from their desire to redeem him from captivity, how he told them that the Carthaginians had given him a slow poison, which would soon terminate his life; and how, finally, when the Senate, through his influence, refused the offers of the Carthaginians, he firmly resisted all the persuasions of his friends to remain in Rome, and returned to Carthage, where a martyr's death awaited him. It is related that he was placed in a barrel covered over with iron nails, and thus perished. Other writers state, in addition, that, after his eyelids had been cut off, he was first thrown into a dark dungeon, and then suddenly exposed to the full rays of a burning sun. When the news of the barbarous death of Regulus reached Rome, the Senate is said to have given Hamilcar and Bostar, two of the noblest Carthaginian prisoners, to the family of Regulus, who revenged themselves by putting them to death with cruel torments.