Hanno had marched to the relief of Utica, and gained a considerable advantage, which, had he made a proper use of it, might have proved decisive: but entering the city, and only diverting himself there, the mercenaries, who had retreated to a neighbouring hill covered with trees, hearing how careless the enemy were, poured down upon them; found the soldiers straggling in all parts; took and plundered the camp, and seized upon all the supplies that had been brought from Carthage for the relief of the besieged. Nor was this the only error committed by Hanno; and errors, in such critical junctures, are much the most fatal. Hamilcar, surnamed Barca, was therefore appointed to succeed him. This general answered the idea which had been entertained of him; and his first success was the obliging the rebels to raise the siege of Utica. He then marched against their army which was encamped near Carthage; defeated part of it, and seized almost all their advantageous posts. These successes revived the courage of the Carthaginians. The arrival of a young Numidian nobleman, Naravasus by name, who, out of esteem for the person and merit of Barca, joined him with two thousand Numidians, was of great service to that general. Animated by this reinforcement, he fell upon the rebels, who had cooped him up in a valley; killed ten thousand of them, and took four thousand prisoners. The young Numidian distinguished himself greatly in this battle. Barca took into his troops as many of the prisoners as were desirous of being enlisted, and gave the rest free liberty to go wherever they pleased, on condition that they should never take up arms any more against the Carthaginians; otherwise, that every man of them, if taken, should be put to death. This conduct proves the wisdom of that general. He thought this a better expedient than extreme severity. And indeed where a multitude of mutineers are concerned, the greatest part of whom have been drawn in by the persuasions of the most hotheaded, or through fear of the most furious, clemency seldom fails of being successful.