Further enraged at the heroic resistance, Frederick resorted to one of those measures of barbarity which seem almost incredible when rehearsed to modern ears. He brought forth the Cremascan prisoners whom he had previously spared, bound them in chains and suspended them by ropes beneath their arms from the front of the cat. The Cremascans beheld with horror their friends and relatives thus used to shield the foe; but at length the needs of the many were held by the consul, Giovanni de Medici, to outweigh the interests of the unfortunate few, and the missiles of defence were again brought to bear upon the cat. Nine of the unfortunate Cremascans dangling from the cat were killed, and others were frightfully injured; but the occupants of the structure also suffered to such an extent that they were glad presently to retire and for the moment to acknowledge themselves beaten. [Illustration: A GERMAN OFFICER, TWELFTH CENTURY] Where the invaders had failed by open attack, they in the end succeeded through the treachery of a Cremascan, one Marchisio, a mechanic of great ingenuity, whose skill had largely aided the besieged garrison in repulsing the enemy’s attack. Frederick found a way to approach this man and through bribery to gain him over. The importance laid upon this incident by the chroniclers of the siege illustrates the value that attached to individual effort in the warfare of those times. The reader of Roman history will recall how Archimedes long saved Syracuse from destruction by the ingenuity with which he contrived means to repel the assaults of the Romans. Warfare had but little changed in the interval of about fourteen hundred years--had, indeed, but little changed since the early days of the Egyptians and Babylonians--and the presence of one inventive mind might seemingly suffice to turn the tide for or against the besieged city. So now Marchisio, as the story goes, was able to point out at once to Frederick the inadequacy of his method of attack. He caused the emperor to abandon his cats, and to build in their place gigantic towers, the largest being, it is said, about one hundred cubits in height, and having attached to one of its upper stories a bridge no less than forty-six cubits long, which would enable its occupants to reach the wall of a city while their machine was yet at a considerable distance. The tower itself was further guarded from missiles by brass and iron plates.