What was the significance of the First Battle of the Marne (1914)?

• A. The Battle of the Marne marked the turning point that halted the German advance
• B. It stopped the German advance into France
• C. It opened the way for Italy to join the war
• D. It began a naval blockade against Germany

Answer: (A)

This battle shows how a single clash can change the entire course of a war. The significance lies in halting the German sweep into France and, more importantly, stopping the rapid German victory that the Schlieffen Plan depended on. By preventing a quick collapse of France and saving Paris from capture, the Allies forced Germany to retreat and settle into a long, stalemate along entrenched lines from the North Sea to Switzerland. That shift—from fast, mobile warfare to trench warfare—defined the Western Front for most of the war.

The other ideas don’t fit as well: Italy did not suddenly join the war because of this battle, as Italy would enter in 1915 for other reasons; and the naval blockade against Germany was a separate, ongoing effort not initiated by this land engagement.