Witiges laid siege to Rome with an army said by Procopius[d] to have amounted to 150,000 men; yet this army was insufficient to invest the whole circuit of the city. The Gothic king distributed his troops in seven fortified camps; six were formed to surround the city, and the seventh was placed to protect the Milvian bridge. Five camps covered the space from the Prænestine to the Flaminian gates, and the remaining camp was formed beyond the Tiber, in the plain below the Vatican. By these arrangements the Goths only commanded about half the circuit of Rome, and the roads to Naples and to the ports at the mouth of the Tiber remained open. The Roman infantry was now the weakest part of a Roman army. Even in the defence of a fortified city it was subordinate to the cavalry, and the military superiority of the Roman arms was sustained by mercenary horsemen. It is strange to find the tactics of the Middle Ages described by Procopius in classic Greek. In spite of the prudent arrangements adopted by Belisarius to insure supplies of provisions from his recent conquests in Sicily and Africa, Rome suffered very severely from famine during the siege; but the Gothic army was compelled to undergo equal hardships, and suffered far greater losses from disease. The communications of the garrison with the coast were for a time interrupted, but at last a body of five thousand fresh troops and an abundant supply of provisions, despatched by Justinian to the assistance of Belisarius, entered Rome. Shortly after the arrival of this reinforcement, the Goths found themselves constrained to abandon the siege, in which they had persevered for a year. Justinian again augmented his army in Italy, by sending over seven thousand troops under the command of the eunuch Narses, a man whose military talents were in no way inferior to those of Belisarius, and whose name occupies an equally important place in the history of Italy. The emperor, guided by the prudent jealousy which dictated the strictest control over all the powerful generals of the empire, had conferred on Narses an independent authority over his own division, and that general, presuming too far on his knowledge of Justinian’s feelings, ventured to throw serious obstacles in the way of Belisarius. The dissensions of the two generals delayed the progress of the Roman arms. The Goths availed themselves of the opportunity to continue the war with vigour; they succeeded in reconquering Mediolanum, which had admitted a Roman garrison, and sacked the city, which was second only to Rome in wealth and population. They massacred the whole male population, and behaved with such cruelty that three hundred thousand persons were said to have perished--a number which probably only indicates the whole population of Mediolanum at this period.