And, in truth, fortresses are unserviceable in every way, since they may be lost either by the treachery of those to whom you commit their defence, or by the overwhelming strength of an assailant, or else by famine. And where you seek to recover a State which you have lost, and in which only the fortress remains to you, if that fortress is to be of any service or assistance to you, you must have an army wherewith to attack the enemy who has driven you out. But with such an army you might succeed in recovering your State as readily without a fortress as with one; nay, perhaps, even more readily, since your subjects, had you not used them ill, from the overweening confidence your fortress gave you, might then have felt better disposed towards you. And the event shows that in times of adversity this very fortress of Milan has been of no advantage whatever, either to the Sforzas or to the French; but, on the contrary, has brought ruin on both, because, trusting to it, they did not turn their thoughts to nobler methods for preserving that State. Guido Ubaldo, duke of Urbino and son to Duke Federigo, who in his day was a warrior of much renown, but who was driven from his dominions by Cesare Borgia, son to Pope Alexander VI., when afterwards, by a sudden stroke of good fortune, he was restored to the dukedom caused all the fortresses of the country to be dismantled, judging them to be hurtful. For as he was beloved by his subjects, so far as they were concerned he had no need for fortresses; while, as against foreign enemies, he saw he could not defend them, since this would have required an army kept constantly in the field. For which reasons he made them be razed to the ground. When Pope Julius II. had driven the Bentivogli from Bologna, after erecting a citadel in that town, he caused the people to be cruelly oppressed by his governor; whereupon, the people rebelled, and he forthwith lost the citadel; so that his citadel, and the oppressions to which it led, were of less service to him than different behaviour on his part had been. When Niccolo da Castello, the ancestor of the Vitelli, returned to his country out of exile, he straightway pulled down the two fortresses built there by Pope Sixtus IV., perceiving that it was not by fortresses, but by the good-will of the people, that he could be maintained in his government.