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Battle of Tannenberg
Battle of Tannenberg, (August 26–30, 1914), World War I battle fought at Tannenberg, East Prussia (now Stębark, Poland), that ended in a German victory over the Russians. The crushing defeat occurred barely a month into the conflict, but it became emblematic of the Russian Empire's experience in World War I. -
First Battle of the Marne
First Battle of the Marne, (September 6–12, 1914), an offensive during World War I by the French army and the British Expeditionary Force (BEF) against the advancing Germans who had invaded Belgium and northeastern France and were within 30 miles (48 km) of Paris.