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Battle of Tannenberg
The Battle of Tannenberg was fought between Russia and Germany. Two Russian armies invaded German East Prussia but advanced too quickly and separated. Due to the separation, German commanders attacked one of the armies near the Prussian village of Tannenberg. Injury and death casualties included around 30,000 Russian soldiers and 13,000 Germans. Germany defeated Russia in the battle, causing the Russian loss of half of the Second Russian Army and the suicide of General Alexander Samsonov.