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|Part of World War I|
| Russian Empire|| German Empire (1914—17)|
Weimar Republic (1917)
|Commanders and leaders|
| Nicholas II|| Wilhelm II|
| 12,000,000|| / 10,000,000|
|Casualties and losses|
| 1,831,219 killed or missing, 1,874,318 wounded, 672,000 POWs|
| / 2,014,832 killed or missing, 2,021,924 wounded, 825,250 POWs|
The Eastern Front (Russian: Восточный фронт) was a theater of operations of World War I in the east and center of Europe.
1914: Opening moves
As war began across Europe following the assassination of in Sarajevo, the German Empire declared war on the Russian Empire, on 1 August 1914. Austria-Hungary did the same, and operations soon began. The Russian Stavka (high command) ordered a general offensive. The East Prussian Offensive began in mid August. Several early skirmishes saw Russian forces prevail over the defending German Eighth Army, culiminating at the Battle of Tannenberg. At Tannenberg, the Russian Second Army defeated the Eighth Army and gave it heavy casualties, resulting in the Germans being forced to leave East Prussia by 1 September. The first major operation on the Eastern Front was a success.