Tannenberg, turning point of the war

The German 8th army under General von Hindenburg stopped the headlong advance through East Prussia by the Russian 2nd army at Tannenberg (today, Stebark in Poland). A week later, slightly to the northeast, the Russian 1st army was defeated at the Masurian Lakes by General Ludendorff. These two Russian armies, numbering 400,000 men each, fought a German army of only 200,000. The German victory was crushing: the Russians lost almost 80,000 men, 93,000 were taken prisoner, and the rest fled. The Germans lost only 5000 men, and 7000 men were wounded.