Joffre ordered the French forces to retreat to a line along the River Seine. Here, Joffre planned to attack the German Ist Army on September 6. The British Expeditionary Force agreed to join the attack.
September 6: French 6th Army attacked the German Ist Army on 6th September. A 50km gap opened between the 1st and German 2nd Army. British forces and French 5th advanced into the gap.
September 9: General Helmuth von Moltke orders General Karl von Bulow and General Alexander von Kluck to retreat.
British and French forces cross the Marne.
By 10th September, the Battle of the Marne was over.
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