First Battle of the Marne

Definition and stakes

Days to Remember: The British Empire in the Great War

The First Battle of the Marne may well rank as the greatest, because the most critical, contest of the war. It was decisive in the sense that it defeated Germany's first plan of campaign. She had hoped for a "battle without a morrow"; but the battle had been fought and the morrow was come. She was now compelled to accept the slow war of entrenchments, and to see every week bringing her nearer to the condition of a beleaguered city. The immediate cause of victory was Maunoury's flank attack, which opened the way for the British and Franchet d'Esperey.
Source: Gutenberg

Clair W. Hayes The Boy Allies on the Firing Line…

For seven solid hours the battle for the opposite shore of the Marne continued, both sides fighting desperately and heroically. Then, as the Germans continued to retreat, General French called a halt. The British fell to work digging trenches in the recently won ground, and preparing to resist an attack should one be delivered.
This first skirmish on the eastern banks of the Marne, while possibly unimportant, when viewed in the light of later events, became one of the greatest factors in the offensive movements of the Allies.
Source: Gutenberg

G. H. Perris The Battle of the Marne

Why and how were the original plans of campaign modified to reach this result? What conditions of victory existed on the Marne that had been lacking on the Sambre? In a word, the key to the meaning of the battle must be sought in the character of the forces in play, their comparative numbers, organisation, and training, armament and equipment, leadership and inspiration.
No sooner is such an inquiry opened than a number of derivative problems appear. Where exactly lay the German superiority of force at the outset, and why was it not maintained? Was the first French concentration justifiable?
Source: Gutenberg

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