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The Masuria-Augustów operation of 1915 (in German literature called theWinter Battle in Masuria of 1915, and in Russian literature - the Augustów opera-tion of 1915). The operation of the German troops of the Tenth and Eighth Armies- altogether 250,000 soldiers, against the Russian Tenth Army commanded by Ge-neral F. W. Siwers which equaled German forces in number. German commanderHinderburg (Chief...