East Prussian campaign | |||||||||
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Part of the Eastern Front of World War I | |||||||||
Eastern Front, 17–23 August 1914. | |||||||||
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Belligerents | |||||||||
German Empire | Russian Empire | ||||||||
Commanders and leaders | |||||||||
Paul von Hindenburg Erich Ludendorff Max Hoffmann Maximilian von Prittwitz |
Nicholas Nikolaevich Yakov Zhilinsky Paul von Rennenkampf Alexander Samsonov † Vasily Flug | ||||||||
Units involved | |||||||||
VIII Army |
I Army II Army | ||||||||
Strength | |||||||||
Initial: 209,000 men[a] 1,044 guns[5] |
Initial: 1st Army: 150,000 and 702 guns 2nd army: 100,000 men and 402 guns Total: 250,000–400,000[6] men and 1,100 guns[7][b] | ||||||||
Casualties and losses | |||||||||
Official German medical reports: Other estimates: Stallupönen – 1,300;[11] Gumbinnen – 14,600;[12] Tannenberg – 12,000;[13] Masurian lakes – 10,000[14] or 40,000[15][16][17] Total: 37,000[18]–100,000[19] |
Tanneberg: 90,000[Note 1][20] Masurian Lakes: 100,000[21][22][Note 2] Gumbinnen: 18,000 Stalluppen: 6,000[23] Total: 160,000–240,000 casualties 60,000–100,000 taken prisoner[19][20] |
The Russian invasion of East Prussia occurred during World War I, lasting from August to September 1914. As well as being the natural course for the Russian Empire to take upon the declaration of war on the German Empire, it was also an attempt to focus the Imperial German Army on the Eastern Front, as opposed to the Western Front. Despite having an overwhelming superiority over the Germans in numbers, the invading Imperial Russian Army spread its forces thin and was defeated in the battles of Tannenberg and the Masurian Lakes, resulting in a complete strategic collapse of the Russian invasion.
The shock of the invasion served to assist the German war effort. According to Alexander Watson "Outrage at the violation of national territory and Tsarist atrocities strengthened German solidarity, cemented conviction in the righteousness of the national cause, and acted as a terrible and lasting warning of the penalties of defeat".[24]
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