World War I: The Complete History · 9 May 2026 · 12 min

Schlieffen, the Marne, and the War Nobody Planned For

Germany's Schlieffen Plan promised a six-week victory — instead it unleashed a war no one could stop. Episode 4 traces the invasion of Belgium, the fall of France's Plan XVII, and the Battle of the Marne that buried every general's assumptions.

World War I: The Complete History
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Schlieffen, the Marne, and the War Nobody Planned For

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What's covered

The March That Changed Everything

August fourth, nineteen fourteen. A column of German infantry crosses the Belgian border.

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The Violation of Belgium

The Belgian army was small. Around two hundred thousand men facing the full weight of Germany's western force.

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The German Advance and the Fall of France's Plan

Meanwhile, France had its own plan. It was called Plan XVII, and it was built around a different theory entirely.

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The Miracle of the Marne

The French government prepared to evacuate the capital. German cavalry patrols were reported within thirty miles of Paris.

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The Race to the Sea

Both sides now faced an open flank to the north. Neither army had yet reached the English Channel.

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Why the Trenches?

This is the part that needs explaining, because it's easy to look back and wonder why both sides simply accepted this situation. Why dig in?

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What the Opening Campaign Cost

Before we close on nineteen fourteen, the scale of the losses deserves a moment's attention. France lost approximately three hundred thousand dead in the first five months of the war.

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The End of Movement, The Start of Attrition

By December nineteen fourteen, the Western Front had set. Both sides were entrenched.

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