Battles of WWI

Battle of Tannenberg (August 1914)

Period: Aug 26, 1914 to Aug 30, 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

First Battle of Marne (September 1914)

Period: Sep 15, 1914 to Sep 12, 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