Battle of Tannenberg

Date: August 30, 1914 • Location: Olsztyn, Poland

World War I: The Battle of Tannenberg resulted in the almost complete destruction of the Russian 2nd Army by the German 8th Army.

World War I, or the First World War, also known as the Great War, was a global conflict between two coalitions: the Allies and the Central Powers. One of the deadliest conflicts in history, World War I caused 15 to 22 million deaths, including those resulting from war crimes and genocides. The war also contributed to the spread of the Spanish flu pandemic. The conflict saw important developments in weaponry, including machine guns, artillery, aircraft, chemical weapons, and tanks.