Siege

Siege is presented as the decisive trial of a state that cannot safely meet an enemy in the open field. A prince who lacks the men and money to confront an assailant must withdraw behind fortified walls, but fortification alone is not enough: security also depends on provisions, military preparation, and a relationship with subjects strong enough to withstand hardship. The condition therefore joins physical defence to political legitimacy. A city may be difficult to capture because of its walls, yet it becomes truly durable only when an attacker cannot easily turn its inhabitants against their ruler.

Definition and Strategic Conditions

A prince is able to stand alone when the resources at his disposal allow him to assemble an army capable of taking the field against any assailant. A prince who cannot do this must rely on the defensive strength of his town, retiring behind its walls rather than attempting to control the countryside. The recommended response is to strengthen and fortify the place of residence while avoiding the hatred of its subjects, because an enemy approaches cautiously when both the town and the political order inside it promise resistance.

The logic of siege also appears in the broader problem of holding conquered territory. In a province with different language, customs, and laws, a new prince must prevent a powerful foreigner from gaining entry through local discontent. Disaffected inhabitants may invite an outside power in through ambition or fear, after which weaker forces commonly attach themselves to the stranger. A ruler who anticipates this danger can preserve supremacy by protecting weaker neighbours, weakening stronger ones, and preventing a rival power from acquiring influence before the threat becomes immediate.

Fortifications, Supplies, and Civic Endurance

The German towns are offered as a concrete model of defensive preparedness. Their freedom is supported by moats, suitable ramparts, artillery, and public magazines stocked with food, drink, and fuel sufficient for a year. They also maintain a common reserve of materials that enables poorer citizens to continue their handicrafts for a year without imposing a public loss. Military exercises and regulations reinforce this material preparation. Their strength is therefore not merely architectural; it rests on the organized capacity of the town to sustain both defence and ordinary life during prolonged isolation.

A strongly fortified town whose prince is not hated is difficult to attack successfully. An assailant cannot easily keep an army in leaguer for a whole year without interruption, and the prospect of a long, uncertain operation makes the enterprise unattractive from the beginning. The defensive advantage is greatest when the town possesses enough supplies and other means of defence to prevent the pressure of siege from becoming an internal crisis.

The Prince and the Besieged Population

The ruler’s conduct during a siege determines whether material suffering becomes political collapse. A capable and courageous prince may sustain the inhabitants’ spirits by promising that the danger will not last, by arousing fear of the enemy’s cruelty, and by silencing those whose complaints threaten collective resolution. These are not interchangeable measures: hope offers endurance a future, fear defines surrender as dangerous, and the suppression of disruptive voices protects a common line of action.

The destruction of property outside the walls does not necessarily dissolve loyalty. An enemy will often burn and lay waste to the countryside immediately upon arrival, when the inhabitants’ first ardour for defence is still strong. After the damage has been done, however, the people may make common cause with their prince because their homes have been burned and their lands wasted in his defence. The population then experiences the ruler as bound to its losses, while the ruler can appeal to the mutual obligations created by the sacrifices of defence. On this account, a prudent prince should be able to preserve the morale of his subjects both at the beginning of a siege and as it continues, provided that food and defensive resources do not run short.

Siege in Examples of Conquest and War

Agathocles of Syracuse demonstrates that siege can be endured through an active combination of defence and counterattack. After seizing power by arranging for his soldiers to kill the senators and wealthiest citizens, he suffered two defeats at the hands of the Carthaginians and was subsequently besieged. He nevertheless defended Syracuse while sending part of his forces into Africa. This diversion enabled him to raise the siege, place the Carthaginians in extreme difficulty, and compel them to accept terms under which they abandoned Sicily to him and confined themselves to Africa. The episode presents a siege not as passive confinement but as a crisis that may be reversed by offensive action beyond the walls.

The book also treats siege as an avoidable consequence of poor strategic timing. Wise rulers are expected to detect the disorders of a state while they remain remote and manageable. The Romans therefore chose to make war against Philip and Antiochus in Greece rather than wait until those powers could threaten Italy. War, in this analysis, cannot simply be escaped by delay; it is postponed to the advantage of the other side. Preventive action is thus connected to the defensive problem of siege: a ruler who refuses to confront a growing danger may eventually be forced to defend a more vulnerable territory under worse conditions.

Political Alliances and the Security of a State

The same principle governs alliances. A prince should not join a stronger power in attacking another unless necessity leaves no alternative, because victory may place the weaker ally at the victor’s mercy. The Venetians joined France against the Duke of Milan even though the alliance could have been declined, and the decision brought about their ruin. The Florentines, by contrast, faced a situation in which the Pope and Spain together led their armies against Lombardy and could not safely remain outside the conflict; in such circumstances, taking a side was unavoidable.

Neutrality is therefore not a universally safe refuge. Every policy carries uncertainty, and prudence consists in distinguishing degrees of disadvantage rather than imagining that all danger can be removed. The question is whether a state can preserve the political and material conditions that make resistance possible. A siege exposes the cost of failing to do so: once a stronger stranger has entered a province, once local factions have summoned outside assistance, or once war has been postponed until the enemy has gained an advantage, walls may remain standing while the state’s strategic freedom has already been lost.