The first and second Battle of the Marne were similar because they were both fought in the same area, near the Marne River, and both were important Allied victories. The first Battle of the Marne was fought between September 5 - 12, 1914.
The first Battle of the Marne began on September 6, 1914, and ended on September 12, 1914. During the First Battle of the Marne, 250,000 French soldiers were lost and the Germans suffered about the same casualties. The BEF lost just under 13,000 men.