Princes have tried various tactics to maintain power: disarming their subjects, dividing their subjects into factions, encouraging their enemies, winning over the suspicious, building new fortresses, and tearing down fortresses.
New princes must never disarm their subjects, for if a prince arms his people, their arms become his. If a prince disarms them, the people will hate him, and he will be forced to employ mercenaries.
Conventional wisdom says that creating factions is a good way to control a state. This may have been true when Italy was more stable, but not in Machiavelli's time. When factious cities are threatened by invaders, they quickly fall.
Because rulers become great by overcoming difficulties, some believe that a prince should secretly encourage his enemies, so that when he overcomes them, his reputation will be greater.
Some new princes find that those who were at first suspect prove more useful than others in governing the state. They are anxious to prove themselves to the prince. Those who helped the prince gain power may have done so out of dissatisfaction with the prior state, and the new state may also fail to please them.
Princes often build fortresses to protect themselves from plotters and sudden attacks. If a prince fears his subjects more than foreign invaders, he should build fortresses. The best fortress, however, is not to be hated by the people.
