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First Battle of the Marne
The French and British armies counterattacked the German army, which had invaded France and Belgium and was within 30 miles of Paris. The French surprise attack halted the German advance, and both sides dug in. The battle was a strategic victory for the French, but the Germans were able to capture a large part of the industrial northeast of France. -
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Battle of Tannenberg
When the Russian 2nd Army advanced into East Prussia during the early stages of World War I, and the German 8th Army launched a concentrated attack against them, exploiting poor Russian communication and coordination to encircle and decisively defeat Samsonov's forces. Near the city of Tannenberg, Germany vs. Russia, German victory, with the Russians losing almost an entire army.