It is obvious that this purely rational treatment of warlike affairs allowed, under certain circumstances, of the worst atrocities, even in the absence of a strong political hatred, as, for instance, when the plunder of a city had been promised to the troops. After the forty days' devastation of Piacenza, which Sforza was compelled to permit to his soldiers (1477), the town long stood empty, and at last had to be peopled by force. Yet outrages like these were nothing compared with the misery which was afterwards brought upon Italy by foreign troops, and most of all by the Spaniards, in whom perhaps a touch of oriental blood, perhaps familiarity with the spectacles of the Inquisition, had unloosed the devilish element of human nature. After seeing them at work at Prato, Rome, and elsewhere, it is not easy to take any interest of the higher sort in Ferdinand the Catholic and Charles V who knew what these hordes were, and yet unchained them. The mass of documents which are gradually brought to light from the cabinets of these rulers will always remain an important source of historical information; but from such men no fruitful political conception can be looked for.
