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First Battle of the Masurian Lakes Part of the Eastern Front of World War I Eastern Front to 26 September 1914. Date 7–14 September 1914 Location East Prussia, Germany (present-day Poland) Result German victory Russian ejection from East Prussia Belligerents   German Empire   Russian Empire Commanders and leaders Paul von Hindenburg Paul von Rennenkampf Units involved 8th Army 1st Army 10th Army Strength Total 215,000 soldiers: [1] 16 infantry divisions 2 cavalry divisions unknown Casualties and losses 10,000 killed, wounded and missing [2] [3] Another estimate: 40,000 killed, wounded and missing [4] [5] [6] [7] [8] [9] [10] 100,000 [11] [12] - 125,000 killed, wounded and captured, [13] [14] [15] of them 70,000 killed and wounded, [4] 30,000 [16] - 45,000 prisoners Another estimation: 40,000  – 45,000 killed, wounded or captured v t e East Prussian Campaign Stallupönen Gumbinnen Tannenberg 1st Masurian Lakes The First Battle of the Masurian Lakes was a German offensive in ...

For the 1410 battle at the same location, see Battle of Grunwald. For the 1944 battle in Estonia, see Battle of Tannenberg Line. Battle of Tannenberg Part of the East Prussian campaign of the Eastern Front in World War I Russian prisoners of war after the Battle of Tannenberg. Date 26–30 August 1914 Location Near Allenstein, East Prussia (today Olsztyn, Poland) 53°29′45″N 20°08′4″E  /  53.49583°N 20.13444°E  / 53.49583; 20.13444 Coordinates: 53°29′45″N 20°08′4″E  /  53.49583°N 20.13444°E  / 53.49583; 20.13444 Result Decisive German victory Second Russian Army annihilated Belligerents   German Empire   Russian Empire Commanders and leaders Paul von Hindenburg Erich Ludendorff Max Hoffmann Alexander Samsonov   † Units involved 8th Army 1st Army 2nd Army Strength 150,000 [1] 230,000 [2] Casualties and losses 10,000–15,000 killed or wounded [3] 12,000 killed or wounded [1] Official German data 21–30/08/14: 13,873: [4] 1,726 KIA 7,461 WIA 4,686 MIA 170,000: 78,000 killed or w...