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Military & Conflict

Fighting the Last War

Model #0806Category: Military & ConflictDepth to apply:
4 min read

On this page

  • Core Idea
  • How to See It
  • How to Use It
  • Founders & Leaders
  • Connected Models
  • One Key Quote
  • Summary & Further Reading

Contents

  1. 1. Core Idea
  2. 2. How to See It
  3. 3. How to Use It
  4. 4. Founders & Leaders
  5. 5. Connected Models
  6. 6. One Key Quote
  7. 7. Summary & Further Reading
·Military & Conflict
Section 1

Core Idea

Fighting the last war means applying strategies, structures, and assumptions that worked in a previous conflict to a fundamentally different new one. In military history, generals build for the war they just fought — France's Maginot Line was designed for World War I's trench warfare and was irrelevant against World War II's mobile blitzkrieg. In business, companies optimise for the competitive dynamics that made them successful and fail to recognise when the game has changed. The core idea: past success creates mental models that become liabilities when conditions shift.
Section 2

How to See It

Strategy & Planning
You're seeing Fighting the Last War when a company's strategy is essentially "do what worked before, but more" — doubling down on the same channels, the same product model, the same competitive posture — without questioning whether the underlying dynamics have changed.
Industry Disruption
You're seeing Fighting the Last War when an incumbent responds to a disruptive competitor by improving the old product instead of engaging with the new model. They're optimising for the previous game.
Section 3

How to Use It

Regularly audit your strategy for assumptions inherited from past success. Ask: "What has changed since this strategy was designed? Are we optimising for the current game or the last one?" Seek disconfirming evidence — signals that the competitive landscape has shifted. Build teams and cultures that question "how we've always done it."
Decision filter
"Is this strategy designed for the market we're in now, or the one we were in when it was created? What has changed that might make our winning playbook obsolete?"
As a founder
Your biggest risk after early success is assuming the same playbook works forever. Schedule regular strategy reviews that explicitly question inherited assumptions. Hire people from adjacent industries who see your market with fresh eyes. The playbook that got you here may not get you there.
Section 5

Founders & Leaders

Reed HastingsCo-founder & CEO, Netflix
Hastings avoided fighting the last war twice. First, he recognised that Netflix's DVD-by-mail business — despite its success — was optimised for a world that streaming would replace, so he cannibalised his own model before competitors could. Second, when streaming became competitive, he shifted Netflix into original content rather than fighting a licensing war on others' terms. Each pivot required abandoning a winning strategy before it stopped winning. Founders can apply this by asking: "If we were starting today, would we build what we have?" If the answer is no, you're at risk of fighting the last war. The hardest strategic move is abandoning what's working before it stops working.
Section 7

Connected Models

Reinforces
Disruptive Innovation
Disruptive innovation succeeds precisely because incumbents are fighting the last war — optimising their existing product for existing customers while the disruption changes the game entirely. Recognising the pattern is the first step to avoiding it.
Reinforces
Status Quo Bias
Status quo bias makes people prefer the current state. Fighting the last war is status quo bias at the strategic level — preferring the strategy that worked before because change is uncomfortable, not because it's optimal.
Leads-to
Paradigm Shift
When fighting the last war fails, the result is often a paradigm shift — the old model collapses and is replaced. Organisations that recognise the shift early survive; those fighting the last war are displaced.
Section 8

One Key Quote

"I skate to where the puck is going to be, not where it has been."
— Wayne Gretzky
Section 11

Summary & Further Reading

Fighting the last war means applying strategies from a previous context to a fundamentally different new one. Past success creates mental models that become liabilities when conditions shift. Regularly audit your strategy for inherited assumptions, seek disconfirming evidence, and be willing to abandon winning playbooks before they stop winning.

Why this matters next

mental modelsParadigm Shift

Fighting the Last War applied the Paradigm Shift mental model

mental modelsTrench War

Fighting the Last War applied the Trench War mental model

mental modelsDisruptive Innovation

Fighting the Last War applied the Disruptive Innovation mental model

mental modelsPositioning

Fighting the Last War applied the Positioning mental model

mental modelsBlitzkrieg

Fighting the Last War applied the Blitzkrieg mental model

mental modelsStatus Quo Bias

Fighting the Last War applied the Status Quo Bias mental model

Frequently asked questions

What is Fighting the Last War?+

Fighting the Last War is a mental model used for better thinking and decision-making.

How do you apply Fighting the Last War?+

To apply Fighting the Last War, identify situations where this framework is relevant, then use it as a lens to evaluate your options and decisions. The model is most useful when combined with other complementary mental models.

What category does Fighting the Last War fall under?+

Fighting the Last War falls under the Military & Conflict category of mental models. Other models in this category can be found on the Military & Conflict hub page.

Why is Fighting the Last War important?+

Fighting the Last War is important because it provides a structured way to think about problems that would otherwise be approached with intuition alone. Understanding this model helps you avoid common reasoning errors and make better decisions.

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On this page

  • Core Idea
  • How to See It
  • How to Use It
  • Founders & Leaders
  • Connected Models
  • One Key Quote
  • Summary & Further Reading

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