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Period: to
Battle of Tannenberg (August 1914)
Fought between Germany and Russia in East Prussia Resulted in a decisive German victory and massive losses for the Russian Second Army
Casualty total:150,000 -
Period: to
First Battle of Marne (September 1914)
Marked by the Failure of Germany's Schlieffen plan Allied forces stopped the German advance near Paris, leading to trench warfare.
Casualty total:250,000