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The Eastern Front was a theatre of operations during World War I that spanned the Eastern European region, from the Baltic Sea in the north to the Black Sea in the south. The front was established following the German invasion of Russia in August 1914, and it remained in place until the Russian Revolution of 1917. The primary belligerents on the Eastern Front were Germany, Austria-Hungary, and Russia, although other countries such as Romania and Bulgaria also played significant roles.

Here is a timeline of some key events that led to the establishment of the Eastern Front:

1. July 28, 1914: Austria-Hungary declares war on Serbia, marking the start of World War I.

2. August 1, 1914: Germany declares war on Russia, bringing Russia into the war.

3. August 3, 1914: Germany declares war on France, prompting France to request military assistance from Russia.

4. August 17, 1914: The first major battle of the Eastern Front takes place at Tannenberg, where German forces under General Paul von Hindenburg defeat the Russian Second Army.

5. September 1914: The Russian Army begins a counteroffensive against Germany, but is eventually defeated at the Battle of the Masurian Lakes.

6. October-November 1914: The Eastern Front stabilizes, with Germany occupying most of Poland and Lithuania, while Russia maintains control over the Baltics and Ukraine.

7. 1915-1916: The Eastern Front remains largely static, with both sides engaging in trench warfare and sporadic offensives.

8. 1917: The Russian Revolution leads to the collapse of the Russian Army, and Russia subsequently exits World War I.

The Eastern Front was one of the largest and most complex theaters of operations during World War I, involving millions of troops and resulting in millions of casualties. It played a significant role in shaping the outcome of the war and had profound consequences for the political and territorial landscape of Eastern Europe.