First Battle of the Marne 1914: How the Allies Saved Paris
The First Battle of the Marne (5-12 September 1914) was the Allied counter-attack that stopped the German advance on Paris and ended the Schlieffen Plan. French and British forces exploited a gap of roughly 50 km between two German armies, forced them to retreat about 60 km to the Aisne, and turned a war of movement into the trench stalemate that lasted four years. Each side lost around 250,000 men in a week.
This article explains what happened on the Marne, why Germany's plan broke down, what the famous Paris taxis really did, and which lessons about speed, logistics and reserves are still easy to see in a strategy game.
Why the Germans were on the Marne at all
In August 1914 Germany sent seven armies through Belgium in a vast right hook meant to knock France out in about six weeks. By the first days of September the German 1st Army under Alexander von Kluck and the 2nd Army under Karl von Bülow had marched for a month and reached the Marne river, around 40 km from Paris. The plan itself and its timetable are covered in our article on WW1 railways and the Schlieffen Plan.
The army was exhausted. Infantry had covered up to 30 km a day, supplies came by horse wagon from railheads far behind, and several corps had been detached to guard Antwerp and to fight in East Prussia. Helmuth von Moltke, the chief of staff, was directing the offensive from Luxembourg, hours away from the front by the available communications.
The gap in the German line
On 30 August Kluck made a decision that changed the war. Instead of passing west of Paris as planned, he turned south-east to stay in contact with Bülow, and exposed his right flank to the city. French aircraft spotted the move on 3 September, and General Joseph Gallieni, the military governor of Paris, saw the opportunity.
Between the German 1st and 2nd Armies a gap of about 50 km opened, covered mostly by cavalry. On 4 September General Joseph Joffre, the French commander-in-chief, who had spent two weeks retreating, ordered a counter-offensive. His order of the day on 6 September told the troops that the moment was no longer to look back.
What happened, day by day
- 5 September: The French Sixth Army under Michel-Joseph Maunoury struck Kluck's flank along the Ourcq river, north-east of Paris.
- 6-9 September: Kluck turned back to face Maunoury, widening the gap. The British Expeditionary Force, about 100,000 men under Sir John French, advanced cautiously into it, and the French Fifth Army under Franchet d'Espèrey attacked Bülow's 2nd Army.
- 8-9 September: Ferdinand Foch's Ninth Army held the centre in heavy fighting around the Marshes of Saint-Gond, while the Allied armies threatened to split the Germans entirely.
- 9 September: Lieutenant-Colonel Richard Hentsch, sent by Moltke with discretionary authority, agreed with the army commanders that a withdrawal was necessary. The retreat began that day.
- 12-13 September: The Germans stopped on the Aisne, dug in on the high ground and held the line there.
The Paris taxis: myth and fact
The taxis of the Marne are the best-known detail of the battle. On the night of 6-7 September about 600 Paris taxis, mostly Renault AG models, carried around 6,000 soldiers of the 7th Division to the front, roughly 50 km away. Each trip carried a handful of men, and the vehicles were paid by the meter.
Militarily the contribution was small, since six thousand men were a tiny fraction of the million French soldiers engaged. Its value was symbolic: an early large-scale use of motor transport in a decisive battle, and a boost to morale at a moment when France feared the loss of its capital. Interior lines, railways and the quick shifting of reserves mattered far more than the cars.
Numbers and outcome
- Dates: 5-12 September 1914.
- Allied forces: around 1 million French and 100,000 British soldiers.
- Casualties: roughly 250,000 French (about 80,000 killed), around 13,000 British, and a comparable figure for the Germans.
- Retreat: the Germans fell back about 60 km to the Aisne river.
- Consequence: Moltke was replaced by Erich von Falkenhayn on 14 September.
Neither side was destroyed. The Allies failed to pursue the Germans fast enough to turn the retreat into a rout, and the "Race to the Sea" followed as both armies tried to outflank each other until the line ran from the Swiss border to the North Sea. For the longer story, see the World War 1 timeline and our overview of the biggest battles of World War 1.
Why the Marne mattered
Germany did not lose the war on the Marne, but it lost the chance to win it quickly. A long war against Britain's navy and the industry of the whole Entente was exactly what the General Staff had feared. France, which had lost the border battles in August, learned that retreating to shorten supply lines and then hitting a weak point could reverse a campaign. The line that formed afterwards produced the conditions described in trench warfare in World War 1, and the personalities involved are profiled in World War 1 generals. The Marne's sequel, a 300-day fight for a fortress, is in the article on the Battle of Verdun.
Marne lessons in Frontkrieg
In Frontkrieg, a free real-time World War 1 strategy game in the browser, you meet the same dilemma Kluck faced: an army that moves fast outruns its own support, and an enemy who notices can cut it off. It is worth reading how troop movement and logistics work and how army upkeep drains reserves during a long advance. If you want to counter-attack the way Joffre did, the offensive tactics guide shows how to choose the weak flank.
Frequently asked questions
Who won the First Battle of the Marne?
The Allies (France and Britain). They halted the German advance, saved Paris and forced a retreat to the Aisne, although they did not destroy the German army.
Why was the Battle of the Marne so important?
It ended the Schlieffen Plan and the hope of a quick German victory in the west. After it the war became a long conflict of attrition on a continuous trench front.
Why did Germany lose the Battle of the Marne?
German armies were exhausted and far from their railheads, Kluck turned away from Paris and opened a gap between his army and Bülow's, and the headquarters in Luxembourg had little control over events. The Allies used Paris's rail network and fresh reserves to hit the exposed flank.
Did the Paris taxis really win the battle?
No. About 600 taxis carried roughly 6,000 men, a small part of the force engaged. Their importance was symbolic, but they were a real early example of motorised transport in war.
Conclusion
The First Battle of the Marne was decided by a gap in a stretched army, a commander who dared to counter-attack and a network of railways and roads that moved reserves faster than the enemy could react. It saved Paris, ended Germany's best chance of a quick victory and opened the long war of 1914-1918.
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