Why Don't We Learn from History?

What is this book about?

This short book is the late work of the British strategist B. H. Liddell Hart. Drawing on a lifetime of studying war, he asks one fundamental question: why does humanity never learn from history and keep marching into war? He locates the answer in the cognitive failings of commanders, politicians, and publics alike — vanity, fervour, and folly in the making of war decisions. It is less a history of war than a diagnosis addressed to those who hold power.

Why read it?

It is the summation of a strategist's life and an unsparing reckoning: are the powerful really wiser than the rest of us? Liddell Hart says no, and he is specific about why — from the misreading of intelligence to the way pride and vanity override reason. It is short, but every page dismantles the myth of the grand strategic game. Its limits lie in the author's own position: he was a soldier and strategist of his era, and his judgements carry the marks of that experience.

Core Ideas

• War is a periodically recurring "mental illness" of humanity, hard to stamp out and always repeating.
• Rulers are often hijacked by vanity and fervour into decisions that look grand and are in fact stupid.
• The reason humanity cannot learn from history lies in the double action of cognitive bias and the structure of power.
• Those in power are not naturally wiser than ordinary people; power may in fact magnify their errors.

What questions does this book try to answer?

• Are the powerful really cleverer and more far-sighted than ordinary people?
• Why does humanity never learn from history and keep marching into war?

Who should read it?

For readers interested in military strategy, the philosophy of history, and political decision-making. It is short but dense; some knowledge of the two world wars helps you see what each critique is aimed at.

How to Read It

Liddell Hart's central judgement is pointed: the grand game a ruler thinks he is playing is often just a disaster bred by the fervour for power, and war itself is like a periodic psychosis. Read his critique on two levels: the review of particular wartime decisions, and the general claim about power and human nature. The latter is sharper and easier to abuse, and it is up to the reader to keep distinguishing.