Why did the allies defeat the Germans in the battle of the marne?

The Allies defeated the Germans at the Battle of the Marne in September 1914 primarily due to effective coordination and rapid mobilization of their forces, which allowed them to counter the German advance towards Paris. The unexpected strength and resilience of the French and British troops, bolstered by strategic use of rail transport, disrupted the German plans. Additionally, the Germans were overextended and faced supply issues, which weakened their offensive capabilities. This pivotal battle marked a turning point, leading to trench warfare on the Western Front.