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Rh Romans left under the effectual guard of St. Peter the apostle. The battlements or bastions were shaped in sharp angles; a ditch, broad and deep, protected the foot of the rampart; and the archers on the rampart were assisted by military engines: the balista, a powerful cross-bow, which darted short but massy arrows; the onagri, or wild asses, which, on the principle of a sling, threw stones and bullets of an enormous size. A chain was drawn across the Tiber; the arches of the aqueducts were made impervious, and the mole or sepulchre of Hadrian was converted, for the first time, to the uses of a citadel. That venerable structure, which contained the ashes of the Antonines, was a circular turret, rising from a quadrangular basis: it was covered with the white marble of Paros, and decorated by the statues of gods and heroes; and the lover of the arts must read with a sigh that the works of Praxiteles or Lysippus were torn from their lofty pedestals, and hurled into the ditch on the heads of the besiegers. To each of his lieutenants Belisarius assigned the defence of a gate with the wise and peremptory instruction that, whatever might be the alarm, they should steadily adhere to their respective posts and trust their general for the safety of Rome. The formidable host of the Goths was insufficient to embrace the ample measure of the city; of the fourteen gates, seven only were invested from the Prænestine to the Flaminian way; and Vitiges divided his troops into six camps, each of