War

War is not treated merely as an episode of open fighting but as the governing condition beneath acquisition, defense, alliance, and political survival. A ruler who postpones necessary conflict, neglects military preparation, or relies on forces without a durable bond to the state exposes his power to Fortune and to stronger rivals. Conversely, timely force, disciplined arms, and clear strategic judgment can prevent distant threats from becoming incurable emergencies.

War as Preventive Statecraft

The most decisive claim is that war cannot truly be avoided by refusing to confront a danger. It can only be postponed, and postponement gives the opposing side time to grow stronger. The Romans therefore acted against Philip and Antiochus in Greece before those powers could threaten them in Italy. Their policy was not driven by a love of combat for its own sake, but by the calculation that a limited and timely war was safer than waiting until the enemy had acquired a more dangerous position. Political disorders resemble a disease that is difficult to recognize at its beginning but impossible to cure once it has become obvious. A sagacious ruler must therefore detect them while they are still remote and apply force before circumstances remove the possibility of remedy.

This logic also governs the treatment of newly acquired provinces. A ruler who enters a country whose language, laws, and customs differ from those of his own people must prevent a powerful foreigner from gaining an entrance through local discontent. Disaffected inhabitants may invite an outside power because of ambition or fear, after which weaker neighbors naturally gather around the newcomer. The occupying ruler must protect the weaker powers, restrain the stronger ones, and ensure that no rival becomes powerful enough to dominate the province. War is consequently connected to geography and political alignment: an apparently local grievance can open a route for a stranger whose intervention transforms the entire balance of power.

Conquest, Law, and Military Control

War begins before the battlefield, in the problem of incorporating conquered territory. Provinces of the same language and customs as the conqueror’s hereditary dominions are easier to retain. The new ruler must extinguish the old ruling line while leaving laws and taxes substantially unchanged, allowing the acquired territory to become incorporated into the hereditary state without unnecessary disruption. Where language, usages, and laws differ, retention becomes harder and requires both good fortune and political skill.

Personal residence is one military and administrative remedy. A ruler who lives in the acquired province can detect disorder at its beginning and correct it before it gathers strength. His officials are less able to pillage the population, subjects have direct access to him, and a foreign enemy must approach more cautiously when the ruler is physically present. Colonies offer another method. Established in one or two strategically important places, they serve as the keys of the province and cost less than maintaining a large army. They offend those deprived of fields and houses, but these victims remain poor and dispersed; a permanent military occupation, by contrast, consumes the country’s revenues, burdens the entire population, and turns defeated inhabitants into continuing enemies.

The treatment of free cities presents the harshest version of the argument. A city accustomed to its own laws and freedom may be destroyed, occupied by the ruler in person, or left under its laws while being governed by a small group dependent on the conqueror. The examples of Athens and Thebes under Spartan oligarchies, and of Capua, Carthage, and Numantia under Roman destruction, distinguish temporary supervision from durable control. A free city retains the memory of liberty and ancient law, and that memory becomes a banner for rebellion whenever the conqueror suffers misfortune. Republics possess an especially strong vitality and thirst for revenge; they are therefore safest either when destroyed or when directly inhabited by the conqueror.

Arms and the Prince’s Duty

Good laws and good arms are described as the principal foundations of every state, but military power receives priority because laws cannot be securely maintained without it. The forces available to a ruler may consist of his own subjects, mercenaries, auxiliaries, or a combination of these. Mercenary and auxiliary troops are characterized as dangerous because they are divided, ambitious, disobedient, treacherous, insolent among friends, and cowardly before enemies. Their allegiance rests on pay rather than on political attachment, so they are willing to serve during peace but cannot be relied upon when war demands sacrifice.

Without national arms, a principality depends wholly on Fortune and lacks the strength required to withstand adversity. The decline of the Roman Empire is associated with its employment of Gothic mercenaries: military strength passed to the outsiders who had been hired to defend the state. A reputation for power that is not founded upon an army composed of subjects, citizens, and dependents is consequently unstable. The contrast is not simply between different kinds of soldiers; it is between a force integrated into the political community and a force that regards war as a temporary contract.

Military knowledge must occupy the ruler even during peace. War is called the sole art expected of one who governs, because mastery of it can raise a private person to princely power while neglect of it can reduce an established prince to private life. Francesco Sforza rose from obscurity to become Duke of Milan through his reputation in arms, whereas his descendants lost princely standing by trying to avoid the hardships and fatigue of military life. An unarmed ruler is despised, cannot command the respect of soldiers, and cannot safely trust them. Military preparation therefore requires both practice and study, with peace serving not as an interval of relaxation but as the time when readiness must be most deliberately maintained.

Alliances, Neutrality, and Strategic Choice

War also tests the ruler’s ability to choose sides. When two powerful neighbors fight, remaining neutral is presented as the least secure course. The victor dislikes an uncertain friend who offered no help, while the defeated side has no reason to value an ally who refused to share its danger. Open commitment, by contrast, creates an obligation: if the chosen side wins, the victor has reasons to protect the ally who assisted him; if it loses, the defeated side may still regard that ally favorably and help him when fortunes change.

The dispute involving Antiochus, the Aetolians, the Romans, and the Achaians illustrates this principle. Antiochus urged the Achaians to remain neutral, while the Romans pressed them to take up arms. The Roman argument was that neutrality would bring neither favor nor fame and would leave the Achaians as the prize of whichever power prevailed. Neutrality is thus not an absence of policy. It may conceal dependence on the eventual victor, while depriving the neutral state of influence over the outcome.

Yet commitment must be distinguished from reckless dependence. A prince should avoid joining a stronger power in attacking others unless necessity leaves no alternative, because victory may place the weaker ally at the victor’s mercy. The Venetians’ alliance with France against the Duke of Milan brought about their ruin, while the Florentines, when the Pope and Spain together attacked Lombardy, had to choose a side because no completely safe policy remained. Every course carries danger; prudence consists in recognizing degrees of disadvantage and accepting the lesser evil as the practical good.

War, Popular Power, and Political Survival

The social basis of political power shapes the way war is entered and sustained. Cities contain two opposed dispositions: the people do not wish to be dominated by the nobles, while the nobles wish to dominate and oppress the people. From this conflict may arise a principality, liberty, or license. A prince raised by the nobles faces greater difficulty because many around him consider themselves his equals and cannot be governed as readily. A prince supported by the people stands more nearly alone, with few companions unwilling to obey, and the people’s desire not to be oppressed is easier to satisfy than the nobles’ desire to oppress.

This division matters in war because military security depends on the ruler’s relation to the population and to the elite forces around him. A hostile people may abandon a prince, but hostile nobles can both desert and actively conspire against him, choosing the moment that best protects their own safety. The ruler must therefore manage the political sources of military authority rather than assume that armed strength exists independently of domestic allegiance. War is sustained not only by weapons and fortifications but by the willingness of subjects, citizens, and dependents to remain attached to the state.

Across these arguments, War becomes the test that exposes every weakness in political organization. Conquest without institutional adaptation invites rebellion; delayed action allows danger to mature; foreign troops substitute appearance for strength; neutrality forfeits influence; and dependence on a stronger ally converts victory into subjection. The effective ruler does not seek peace through passivity. He prepares during peace, anticipates disorder, chooses alliances openly, preserves national arms, and uses timely force so that threats remain manageable rather than becoming overwhelming.