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The Danger of Borrowed Armies—And Why You Must Build Your Own — The Prince

The Prince - The Danger of Borrowed Armies—And Why You Must Build Your Own

Niccolò Machiavelli

The Prince

The Danger of Borrowed Armies—And Why You Must Build Your Own

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Analysis by the Wide Reads editorial team·Reviewed against the source text·Updated November 29, 2025

Summary

The Danger of Borrowed Armies—And Why You Must Build Your Own

The Prince by Niccolò Machiavelli

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Machiavelli turns from mercenaries to auxiliaries, the allied troops a prince calls in for aid. They may be good in themselves, but for the prince who borrows them they are always disadvantageous: if you lose, you are undone; if you win, you are their captive.

Pope Julius II learned this when, after Ferrara exposed the weakness of his mercenaries, he threw himself into Ferdinand of Spain's arms. Fortune alone saved him from the usual result: his auxiliaries were routed at Ravenna, then the Swiss drove out the conquerors, so he became prisoner to neither enemy nor ally. The Florentines, unarmed, sent ten thousand Frenchmen against Pisa and ran greater danger than in their other troubles. The Emperor of Constantinople sent ten thousand Turks into Greece, who refused to leave when the war ended, beginning Greece's servitude to infidels.

Auxiliaries are more hazardous than mercenaries because they are united and obey a foreign master. With mercenaries, cowardice is the danger; with auxiliaries, valour is, because they can win and then own you. The wise prince avoids both and would rather lose with his own arms than conquer with another's.

Cesare Borgia shows the progression: French auxiliaries took Imola and Forli, then Orsini and Vitelli mercenaries, then his own men, on whose fidelity his reputation kept rising. Hiero of Syracuse slaughtered useless condottieri and fought with native forces. David rejected Saul's armor because another man's arms fall off, weigh you down, or bind you.

Charles VII built France's own infantry and men-at-arms; Louis XI destroyed the infantry and leaned on the Swiss, leaving France mixed, stronger than mercenaries or auxiliaries alone but far weaker than own forces. Machiavelli closes where Rome began to fall by enlisting the Goths: no principality is secure without forces of its own composed of subjects, citizens, or dependents.

In this chapter: Terms Characters Key Quotes Themes Modern Story

Why This Matters

Connect literature to life

Skill: Refusing Borrowed Armies

Auxiliary arms are allied forces called in to help, and Machiavelli says they are always disadvantageous to the prince who uses them because defeat destroys you while victory makes you the ally's captive. He shows the trap in Julius II's Spanish auxiliaries, Florence's French expedition against Pisa, Constantinople's Turks, Cesare Borgia's move from French soldiers to his own men, and Louis XI's Swiss dependence after Charles VII built native arms. Build forces of your own composed of subjects, citizens, or dependents rather than win with another power's soldiers.

Coming Up in Chapter 14

In the next chapter, Machiavelli turns to another crucial aspect of power and leadership...

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Chapter 13

The Danger of Borrowed Armies—And Why You Must Build Your Own

CONCERNING AUXILIARIES, MIXED SOLDIERY, AND ONE’S OWN Auxiliaries, which are the other useless arm, are employed when a prince is called in with his forces to aid and defend, as was done by Pope Julius in the most recent times; for he, having, in the enterprise against Ferrara, had poor proof of his mercenaries, turned to auxiliaries, and stipulated with Ferdinand, King of Spain,[1] for his assistance with men and arms. These arms may be useful and good in themselves, but for him who calls them in they are always disadvantageous; for losing, one is undone, and winning, one is…

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Key Quotes & Analysis

"In conclusion, in mercenaries dastardy is most dangerous; in auxiliaries, valour. The wise prince, therefore, has always avoided these arms and turned to his own; and has been willing rather to lose with them than to conquer with the others, not deeming that a real victory which is gained with the arms of others."

— Machiavelli

Context: Mercenaries vs auxiliaries

Cowardly mercenaries lose wars; valiant auxiliaries win them for someone else. Own arms are the only victory that counts.

In Today's Words:

Auxiliaries are worse than mercenaries because they arrive as someone else's army. Florence called French troops; the Pope relied on Spain. Both learned that a stronger ally who wins for you can own the outcome afterward. Borrowed victory is often borrowed sovereignty, even when the battle goes your way.

"he was never esteemed more highly than when every one saw that he was complete master of his own forces."

— Machiavelli

Context: Cesare Borgia's progression to native arms

Reputation peaks when observers see you command soldiers loyal to you alone.

In Today's Words:

Machiavelli says losing with your own troops is less shameful than winning with borrowed ones. That is a hard lesson for leaders who want a quick fix. If you cannot defend the result with forces loyal to you, you have not really secured the state. You have rented a temporary advantage.

"I conclude, therefore, that no principality is secure without having its own forces; on the contrary, it is entirely dependent on good fortune, not having the valour which in adversity would defend it. And it has always been the opinion and judgment of wise men that nothing can be so uncertain or unstable as fame or power not founded on its own strength."

— Machiavelli

Context: Closing conclusion

Machiavelli's final military verdict: borrowed power is unstable because it is not yours in crisis.

In Today's Words:

Building your own army in modern terms means developing people, systems, and leverage you control directly. In a campaign, company, or movement, that looks like loyal field staff, owned data, and operators who answer to you rather than to the vendor, donor, or parent organization that could pull them away tomorrow.

"the arms of others either fall from your back, or they weigh you down, or they bind you fast."

— Machiavelli

Context: David rejecting Saul's armor

Borrowed tools do not fit your fight. They fail, burden you, or trap you.

In Today's Words:

Auxiliaries are worse than mercenaries because they arrive as someone else's army. Florence called French troops; the Pope relied on Spain. Both learned that a stronger ally who wins for you can own the outcome afterward. Borrowed victory is often borrowed sovereignty, even when the battle goes your way.

Thematic Threads

Mixed Resources

In This Chapter

Machiavelli explores combining external help with internal capability

Development

This theme connects to the broader analysis of power throughout the work

In Your Life:

Consider how hybrid teams, strategic partnerships, maintaining control appear in your own professional environment

You now have the context. Time to form your own thoughts.

Discussion Questions

This is not a test. Five prompts guide you through the chapter, from how it opens to how it closes, so you notice context and rhythm rather than facts to memorize. Sit with each question in your own words. When you see "One way to read it," treat it as a starting point, not the only answer.

  1. 1

    How do auxiliary arms differ from mercenaries, and why are they even more dangerous?

    ▶One way to read it

    Auxiliaries are another ruler's troops called in to help you. They are united and obedient to their own master. If you lose, you are undone; if you win, you become their captive. Valorous auxiliaries are more dangerous than cowardly mercenaries because victory itself can cost you independence.

    analysis • medium
  2. 2

    What happened to Florence when it called in French auxiliaries, and to Greece when the Emperor sent Turkish troops?

    ▶One way to read it

    Florence sent ten thousand Frenchmen to take Pisa and ran greater danger than in any other crisis. The Emperor of Constantinople invited Turks into Greece; when the war ended, they would not leave, beginning Greek servitude to infidels. Invited allies often stay as masters.

    analysis • medium
  3. 3

    Why does Machiavelli say losing with your own troops is less shameful than winning with borrowed ones?

    ▶One way to read it

    A real victory requires power you control afterward. Borgia's reputation rose highest when everyone saw he commanded his own soldiers. Fame or security not founded on your own strength remains uncertain and can be revoked by whoever lent you the force.

    analysis • deep
  4. 4

    When have you seen an organization win a short-term fight by inviting in a stronger ally who then owned the outcome?

    ▶One way to read it

    Think of startups accepting acquirers for rescue capital, campaigns rescued by a national party that then dictated staffing, or firms that won a market battle only to become dependent on a vendor or investor who supplied the decisive resource.

    application • medium
  5. 5

    What would building your own army look like in a modern campaign or company, not on a battlefield?

    ▶One way to read it

    It means loyal staff, owned data, internal fundraising, and operational capacity that survives if every contractor and patron withdrew tomorrow. Machiavelli's lesson is structural: convert borrowed force into citizens and dependents who answer to you alone.

    application • deep

Critical Thinking Exercise

10 minutes

Applying Mixed Resources

Analyze a current challenge in your professional life through the lens of combining external help with internal capability.

Consider:

  • •How does mixed resources affect your situation?
  • •What strategic options does understanding hybrid teams, strategic partnerships, maintaining control reveal?

Journaling Prompt

How might a deeper understanding of hybrid teams, strategic partnerships, maintaining control change your approach to leadership?

Coming Up Next...

Chapter 14: Why War Is the Only Job a Leader Can Never Outsource

In the next chapter, Machiavelli turns to another crucial aspect of power and leadership...

Continue to Chapter 14
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Why Mercenaries Will Betray You at the Worst Possible Moment
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Why War Is the Only Job a Leader Can Never Outsource
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