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July–August 1918Reputable sourceWell documented

The Second Battle of the Marne

On the timeline · around July–August 1918 · The Second Battle of the Marne1919

What happened

The last great German offensive of the war was halted near the Marne, and a powerful Allied counterattack — bolstered by fresh American troops — threw the Germans back. It marked the turning of the tide on the Western Front.

Why it matters

The Allied victory seized the initiative for good and led directly into the war-winning Hundred Days Offensive.

Sources