Eastern Front (World War I)

The First World War theater in eastern and central Europe, where the Central Powers fought Russia and, later, Romania. Its shifting frontlines stretched across a vast area from the Baltic region to the Black Sea.

Battle of Tannenberg: An August 1914 battle in which German forces encircled and defeated Russia’s Second Army in East Prussia. This early German victory halted Russia’s invasion of East Prussia.
July Crisis: The diplomatic confrontation triggered by the assassination of Archduke Franz Ferdinand that led to war in 1914. The crisis turned Austria-Hungary’s conflict with Serbia into a wider war involving Russia.
Paul von Hindenburg: A German field marshal who became a national hero after victories against Russia in 1914. His command at Tannenberg helped establish Germany’s reputation on the front.
Russian Revolution: The upheavals of 1917 that ended imperial rule in Russia and brought the Bolsheviks to power. The revolution shattered the government’s ability and willingness to continue the war.
Western Front (World War I): The First World War theater in Belgium and France, marked by prolonged trench warfare between the Allies and Central Powers. Its comparatively static front contrasted with the Eastern Front’s long, shifting campaigns.
Battle of Galicia: A major 1914 campaign in which Russian armies defeated Austro-Hungarian forces in Galicia. Russian gains in Galicia contrasted sharply with the defeat at Tannenberg.
Russian mobilization of 1914: The Russian Empire’s 1914 call-up and deployment of forces in response to the European crisis. Mobilization brought Russian armies into East Prussia and Galicia at the war’s outset.
Erich Ludendorff: A German general and strategist who directed major operations on the Eastern Front with Hindenburg. His operational partnership with Hindenburg shaped German campaigning against Russia.
Russian Civil War: The conflict among rival political and military forces in Russia after the 1917 revolutions. Russia’s withdrawal from the world war was followed by a struggle over the state itself.
Italian Front (World War I): The First World War theater between Italy and Austria-Hungary, fought chiefly along the Alps and the Isonzo River. It was another Austro-Hungarian theater, but terrain and operations differed sharply from the eastern plains.

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