---
title: "Second Battle of the Marne | European History"
description: "Second Battle of the Marne was the last major German offensive on the Western Front in 1918, stopped by Allied and American counterattacks."
canonical: "https://fiveable.me/europe-1890-1945/key-terms/second-battle-of-the-marne"
type: "key-term"
subject: "European History – 1890 to 1945"
unit: "Unit 4"
---

# Second Battle of the Marne | European History

## Definition

The Second Battle of the Marne was the last major German offensive on the Western Front in World War I, fought in July and August 1918. Allied forces, including American troops, stopped the attack and pushed Germany back.

## What It Is

The Second Battle of the Marne was the final big German push on the Western Front in World War I, fought from July 15 to August 5, 1918. In this course, it marks the moment when the war clearly shifted away from German initiative and toward Allied momentum.

Germany launched the offensive hoping to break the deadlock before more American troops could arrive in force. The attack was aimed at the Marne area in France, a strategic route toward Paris and a place tied to earlier fighting in the war. If the Germans could win there, they might force a better peace or at least weaken Allied resistance enough to avoid defeat.

That plan failed. French forces, supported by British units and an expanding American presence, absorbed the attack and then counterattacked. The American Expeditionary Forces were not yet the biggest force on the front, but their arrival mattered because they added fresh manpower and morale at a moment when the Germans were overextended.

The battle is not just about one clash of armies. It shows how war outcomes can change when one side loses the ability to keep attacking. After this offensive stalled, Germany’s army had fewer reserves, lower morale, and less room to recover. The Allies did not win the war in one day, but the Second Battle of the Marne made the later Allied offensives possible.

A good way to place it in the chronology of 1918 is this: Germany tries one last gamble, fails, and then the Allies take the offensive. That shift leads directly into the Hundred Days Offensive and, eventually, the Armistice of Compiègne.

## Why It Matters

This battle helps you explain why World War I ended in 1918 instead of dragging on into another year. It shows the point where German strategy stopped looking like an offensive path to victory and started looking like a retreat from exhaustion.

For European History from 1890 to 1945, the Second Battle of the Marne connects several bigger themes at once. It shows the effect of American entry into the war, the limits of trench warfare when one side runs low on men and supplies, and the way coalition warfare can turn a stalemate into a breakthrough. It also sets up the final phase of the war, when Allied attacks became coordinated and relentless.

If you are writing about the end of World War I, this is one of the clearest turning points to mention. It gives you a concrete battle that explains why Germany could no longer force a favorable settlement.

## Connections

### American Expeditionary Forces (AEF)

The AEF mattered at the Second Battle of the Marne because American troops added fresh manpower when Germany was trying to win quickly. They were not fighting alone, but their presence helped stiffen Allied defenses and support the counterattack. In an essay, this term is useful when you want to show that U.S. entry had military effects, not just diplomatic ones.

### [Hundred Days Offensive](/europe-1890-1945/key-terms/hundred-days-offensive)

The Allied success at the Marne opened the door to the Hundred Days Offensive. Once the German advance was stopped, the Allies could keep pressure on the front instead of reacting to German attacks. If you are tracing the end of the war, the Marne is the turning point and the Hundred Days Offensive is the follow-through.

### Armistice of Compiègne

The Armistice of Compiègne came after the German army had already been weakened by defeats like the Second Battle of the Marne. The battle did not end the war by itself, but it helped make continued German resistance unrealistic. When you connect the two, you get the full story of how battlefield setbacks led to the November 1918 armistice.

### [Battle of Amiens](/europe-1890-1945/key-terms/battle-of-amiens)

The Battle of Amiens is another major Allied success in 1918, but it came after the Marne. The Second Battle of the Marne matters because it helped change the overall balance first. Amiens then showed that the Allies could keep winning on a larger scale, not just stop one German offensive.

## On the AP Exam

A quiz or essay prompt may ask you to identify the Second Battle of the Marne as the last major German offensive and explain why it mattered. You might use it in a timeline question, linking it to U.S. entry, Allied counterattacks, and the Armistice of Compiègne. In a short-response or discussion answer, the best move is to show cause and effect: Germany attacked to win before American power fully arrived, the Allies stopped the attack, and the result was a major shift in momentum. If you are comparing battles, use it as evidence that 1918 was no longer a year of German initiative but a year of Allied recovery and advance.

## Second Battle of the Marne vs Battle of Verdun

The Battle of Verdun and the Second Battle of the Marne are both major World War I battles in France, but they belong to different moments in the war. Verdun was a long, grinding 1916 battle of attrition, while the Second Battle of the Marne was a 1918 turning point that marked the failure of Germany's final offensive. If a question asks about the end of the war, Marne is the better fit.

## Key Takeaways

- The Second Battle of the Marne was Germany's last major offensive on the Western Front in World War I.
- It mattered because Allied forces, including American troops, stopped the German advance and then pushed back.
- The battle marked a shift from German attack to Allied momentum, which helped set up the final offensives of 1918.
- For European History from 1890 to 1945, it is a useful turning point for explaining why Germany could no longer win by force.
- You can connect it directly to the American Expeditionary Forces, the Hundred Days Offensive, and the Armistice of Compiègne.

## FAQs

### What is the Second Battle of the Marne in European History?

It was the last major German offensive on the Western Front during World War I, fought in July and August 1918. Allied forces, including American troops, stopped the attack and began pushing Germany back. In the course, it stands out as a turning point in the war.

### Why was the Second Battle of the Marne important?

It showed that Germany could no longer force a decisive victory before American manpower fully arrived. Once the offensive failed, the Allies gained the initiative and moved into the final phase of the war. That makes it a key link between U.S. entry and Germany's defeat.

### How is the Second Battle of the Marne different from Verdun?

Verdun was a long battle of attrition in 1916, famous for its huge losses and symbolic defense of France. The Second Battle of the Marne was a 1918 turning point where Germany's last offensive was stopped. They are both major French battle sites, but they represent different stages of the war.

### What came after the Second Battle of the Marne?

After the German attack was halted, the Allies launched a series of offensives that pushed the Germans back across the Western Front. The next major phase is often described as the Hundred Days Offensive, which helped lead to the Armistice of Compiègne in November 1918.

## Related Study Guides

- [4.4 The Entry of the United States and the War's Conclusion](/europe-1890-1945/unit-4/entry-united-states-wars-conclusion/study-guide/ZHV1I3xINOYFPVK6)

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