Schlieffen Plan: A Detailed Summary

The Schlieffen Plan was the German plan of attack at the beginning of World War I in 1914.  The Schlieffen Plan was designed by and named after the German Army Chief of Staff, Alfred von Schlieffen. He had been asked to design a plan of attack to help ensure German victory at the outbreak of war in Europe.  Since Germany was facing both France and Russia in World War I, Germany would have to deal with a two-front warFighting enemies on opposite sides at the same time, splitting an army’s strength across two borders. and the possibility of its total armed forces being split to fight on both its western and eastern borders.  The Schlieffen Plan was Germany’s response to this problem and at its heart the Schlieffen Plan was designed to prevent Germany from being forced to fight a two-front war.​

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What were the main reasons Germany feared a two-front war in World War I?

Western Border ThreatWestern Border ThreatFrance had heavily fortified its border towns with Germany, making a direct attack costly and slow.Eastern Border ThreatEastern Border ThreatRussia shared Germany's eastern border and could mobilize an army large enough to tie down German forces.Split Forces ProblemSplit Forces ProblemFighting France and Russia at the same time would force Germany to divide its army across two distant borders.Russia's Mobilization SpeedRussia's Mobilization SpeedGermany expected Russia to need six weeks to mobilize, but Russian forces were ready in less than two weeks.The Two-Front War RealizedThe Two-Front War RealizedGermany was stopped at the First Battle of the Marne in September 1914 and had to fight on both borders at once.

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What Was the Schlieffen Plan?

The Schlieffen Plan was designed such that Germany would first attack France through Belgium.  France had fortifiedStrengthened with walls, forts, or other defenses to make a place harder to attack. its border towns with Germany and in order to avoid this, Germany hoped to bypass them completely by invading French territory from Belgium.  The German forces were then to make their way across the French territory until they captured Paris, which was the capital of France.  By capturing Paris, Germany hoped to end the war with France and come to peace or surrender terms with the French. 

Next, German forces would turn their attention to its eastern border and begin the assault against Russia. In the early 1900s Russia was primarily an agricultural-based economy and lacked the heavy industry required to manufacture weapons and tools for war.  As such, Germany believed that Russia would be slow to mobilizeTo organize and move a country’s military forces so they are ready to fight. for the war and take as long as six weeks.  The Schlieffen Plan was designed such that Germany could knock France out of the war before that time and then turn its attention to fighting Russian forces.  For instance, Germany first invaded France, through Belgium, but also fought Russian forces in the East at the Battle of Tannenberg.​

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German Assumption

Germany believed Russia would need approximately six weeks to mobilize its army.

Russia's economy was mostly agricultural, with little heavy industry to supply a war effort quickly.

The Schlieffen Plan depended on this slow Russian response to give Germany time to defeat France first.

Russian Reality

Russia mobilized its forces in less than two weeks, far faster than Germany expected.

Russian troops pushed into East Prussia early enough to force Germany to respond on two fronts at once.

This speed directly undermined the Schlieffen Plan's core assumption and brought about the two-front war Germany feared.

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Germany built its entire war strategy around the idea that Russia would be slow to act, giving German forces time to knock France out of the war first. Russia mobilized in less than two weeks in 1914, collapsing that assumption and forcing Germany into the two-front war the Schlieffen Plan was designed to prevent.

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Did the Schlieffen Plan Work?

In reality, the Schlieffen Plan failed to deliver the result that the Germans hoped for.  The overall plan failed for several different reasons.  First, Germany did not plan on the British forces (British Expeditionary Force) arriving in time to help the Belgian forces defend against the German offensiveA large, organized military attack meant to push into enemy territory..  This slowed the German push towards France and allowed France to prepare for war in the north.  When the Germans finally did push into France they failed to capture Paris and were stopped at the First Battle of the Marne.  At the same time, Russia was able to mobilize its war effort in the east in less than two weeks, and forced Germany to begin to fight a two-front war.​

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Why did the Schlieffen Plan fail to knock France out of the war quickly in 1914?

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British troops slowed the advance, and Germany was stopped at the MarneFrance surrendered Paris early, so Germany turned east too soonRussia never mobilized, so Germany sent too many troops westBelgium surrendered at once, closing the route around French forts

ExplanationGermany did not expect the British Expeditionary Force to arrive in time to help defend Belgium. That delay gave France time to prepare, and German troops were stopped at the First Battle of the Marne before ever reaching Paris.

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What Was the Outcome of the Schlieffen Plan?

In the end, the Schlieffen Plan failed to bring a quick end to World War I and instead led to trench warfare in Northern France.  For instance, following the First Battle of the Marne in 1914, the Allies raced against Germany to ‘outflankTo move troops around the side of an enemy force to attack from an unexpected angle.’ the other in an event known as the ‘Race to the Sea’.​

The ‘Race to the Sea’ occurred throughout September and October of 1914.  The German Army was successfully stopped at the First Battle of the Marne in early September and each side raced north in an attempt to flank the other.  British and French forces countered the German push north throughout September and October until the two sides reached the North Sea in Belgium on October 19th.  What resulted was a line of trenches that extended throughout much of northern Belgium and France.  It was along this line of trenches that some of the most significant battles of World War I took place.​

October 19th, 1914

The Race to the Sea Reaches the North Sea, Sealing the Western Front

After Germany was stopped at the First Battle of the Marne in September 1914, both sides pushed north through Belgium and France, each trying to get around the other's flank. British and French forces countered the German push north throughout September and October until the two sides reached the North Sea coast of Belgium on October 19th, 1914, leaving a continuous line of trenches across northern France and Belgium that defined the Western Front for the rest of the war.

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MLA: Beck, Elias. “Schlieffen Plan: A Detailed Summary.” HistoryCrunch, 29 September 2026, https://historycrunch.com/schlieffen-plan/.

APA: Beck, E. (2026). Schlieffen Plan: A Detailed Summary. HistoryCrunch. https://historycrunch.com/schlieffen-plan/

Chicago: Beck, Elias. “Schlieffen Plan: A Detailed Summary.” HistoryCrunch. September 29, 2026. https://historycrunch.com/schlieffen-plan/

Sources

• Hew Strachan, The First World War.
• Margaret MacMillan, The War That Ended Peace.
• Imperial War Museum
• John Keegan, The First World War.