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In page Paul von Hindenburg:

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On 1 November 1914 Hindenburg was appointed Ober Ost (commander in the east) and was promoted to field marshal. To meet the Russians' renewed push into Silesia, Hindenburg moved the Ninth Army by rail north to Thorn and reinforced it with two corps from the Eighth Army. On 11 November, in a raging snowstorm, his forces surprised the Russian flank in the fierce Battle of Łódź, which ended the immediate Russian threat to Silesia and also captured Poland's second largest city.[citation needed]