Allied Counterattack Opens First Battle of the Marne

Context

In the summer of 1914, following the assassination of Archduke Franz Ferdinand, Europe plunged into war. Germany, anticipating a two-front conflict, activated the Schlieffen Plan, which envisioned a swift sweep through neutral Belgium to defeat France before Russia could fully mobilize.

French commander-in-chief Joseph Joffre confronted early reverses in the Battles of the Frontiers across Lorraine, the Ardennes, Charleroi, and Mons. German armies advanced deep into northeastern France, reaching within striking distance of Paris by early September and forcing the French government to relocate temporarily to Bordeaux.

Anxious French authorities appointed General Joseph Gallieni as military governor of Paris, who pressed for an aggressive defense rather than passive siege preparations.

What Happened

On September 6, 1914, General Michel-Joseph Maunoury’s French Sixth Army struck the exposed right flank of General Alexander von Kluck’s German First Army roughly thirty miles northeast of Paris. The assault widened a gap that had opened between the German First and Second Armies after von Kluck advanced farther than ordered.

General Louis Franchet d’Esperey’s French Fifth Army and divisions of the British Expeditionary Force under Sir John French poured into the breach and assaulted the German Second Army under Karl von Bülow. Fighting intensified over the following days, with Maunoury’s forces holding only after Gallieni rushed approximately 6,000 reinforcements from Paris in commandeered taxis on September 7.

German chief of the general staff Helmuth von Moltke, alarmed by the developing threat and reports of exhausted troops, ordered a general retreat on September 9. Allied pressure continued until the Germans reached the Aisne River.

Aftermath

By September 12 the Germans had established defensive positions along the Aisne, marking the transition from open-field maneuvers to the static trench warfare that defined the Western Front for the remainder of the conflict. The Allied counterattack pushed German forces back forty to fifty miles and secured Paris from immediate capture.

The engagement ended Germany’s hope of a quick victory in the west and forced both sides to confront the likelihood of a protracted war.

Legacy

The failure of the Schlieffen Plan at the Marne ensured that World War I would become a prolonged war of attrition rather than the short, decisive campaign many had anticipated. This outcome drew additional powers, including the United States, into the conflict and ultimately contributed to the collapse of empires and the redrawing of Europe’s map at Versailles.

Historians regard the battle as one of the decisive engagements of the twentieth century because it determined that the war would continue, locking the major powers into a costly stalemate with no clear path to rapid resolution.