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It can easily be argued that the First Battle of the Marne was the single-most important event of World War I for one simple reason: had the Allied forces not achieved a victory against their German opponents in this September 1914 battle, the war would have likely ended in a quick German victory. Success here did not guarantee ultimate victory for the Triple Alliance, nor did it preclude a drawn-out conflict. It did, however, ensure that there would be no easy victory for the Central Powers, which fact proved to be a decisive advantage for the Alliance.

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Q: Why was the first battle of the marne the single most important event of the war?
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