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battle of tannenberg

Period: Aug 23, 1914 to Aug 30, 1914

German forces aimed to counter the Russian invasion of East Prussia during the early stages of WWI. Russia's plans suffered from poor coordination and outdated communications. Decisive German victory.Halted Russian advances into Germany, leading to heavy Russian losses and a blow to Russian morale.

First Battle of the Marne

Period: Sep 6, 1914 to Sep 12, 1914

Part of Germany's Schlieffen Plan, aimed at quickly defeating France by advancing through Belgium and into northern France. Allied victory (France and Britain). Forced the Germans to retreat and marked the end of mobile warfare, beginning the era of trench warfare.

Battle of Gallipoli

Period: Feb 25, 1915 to Jan 9, 1916

Allies aimed to seize the Dardanelles and secure a route to Russia. Ottoman victory. Heavy Allied losses and failure to knock the Ottomans out of the war.