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The Battle of Tannenburg was a decisive engagement between the Russian Empire and the German Empire in the first days of World War I The battle resulted in the almost complete destruction of the Russian Second Army. A series of follow-up battles destroyed the majority of the First Army as well, and kept the Russians off-balance until the spring of 1915. The battle is notable particularly for a number of rapid movements of complete corps by train, allowing the single German Army to present a single front to both Russian Armies.

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Russia and Germany

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26–30 August 1914