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In page Paul von Hindenburg:

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After this decisive victory, Hindenburg re-positioned the Eighth Army to face the Russian First Army. Hindenburg's tactics spurned head-on attacks all along the front in favor of schwerpunkte: sharp, localized hammer blows.[10] Two schwerpunkte struck in the First Battle of the Masurian Lakes. Two columns drove east from these breakthrough points to pocket the Russians led by General Paul von Rennenkampf, who managed to retreat 100 km (62 mi) with heavy losses. In the first six weeks of the war the Russians had lost more than 310,000 men.[11] Eight hundred thousand refugees were able to return to their East Prussian homes, thanks to victories that strikingly contrasted with the bloody deadlock of the Western Front following the failure of the Schlieffen Plan.[citation needed]