First Battle of the Masurian Lakes

A German victory over Russian forces in East Prussia, fought from September 7 to 14, 1914. The battle drove the Russian First Army out of German territory after its invasion earlier that month.

German Eighth Army: The German field army that defended East Prussia and defeated Russia’s First Army at the Masurian Lakes. Its coordinated advance turned the Russian retreat into a withdrawal from East Prussia.
East Prussian campaign of 1914: The opening campaign of the First World War in which Russian armies invaded and German forces defended East Prussia. The battle was the campaign’s second major German victory.
Russian retreat from East Prussia: The Russian First Army’s withdrawal from German East Prussia after defeat at the Masurian Lakes in September 1914. The retreat was the battle’s immediate strategic result.
Russian Second Army: A Russian field army that invaded East Prussia in 1914 under Alexander Samsonov. It was encircled at Tannenberg, unlike the First Army, which escaped the battle and retreated.
Russian First Army: A Russian field army commanded by Paul von Rennenkampf during the invasion of East Prussia in 1914. Its retreat under pressure was the central Russian outcome of the battle.
Russian invasion of East Prussia: The Russian advance into German East Prussia in August 1914 by the First and Second Armies. The First Army’s presence in East Prussia prompted the German counteroffensive.
Russian Tenth Army: A Russian field army formed on the Eastern Front during the First World War. Its later deployment helped defend the frontier after the 1914 German victories in East Prussia.
Battle of the Frontiers: A series of battles fought between France and Germany in August 1914 at the start of the First World War. It was the Western Front counterpart to the opening German-Russian clashes in East Prussia.
Paul von Hindenburg: A German field marshal who commanded forces on the Eastern Front during the First World War. He took command in East Prussia before the German counteroffensive that led to this battle.
Battle of Gumbinnen: An indecisive battle between German and Russian forces in East Prussia on August 20, 1914. The German withdrawal after Gumbinnen opened East Prussia to Russian advances.

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