At the 1914 Battle of Tannenberg in East Prussia, this country's army was surrounded & largely destroyed
.... 
Two Russian armies invaded East Prussia earlier than expected, the Eighth ... 
Nine days later the Eighth Army surrounded most of a Russian army at 
Tannenberg,... [DOC] [TLE] First Battle of the Masurian Lakes - Wikipedia [PAR] The First Battle of the Masurian Lakes was a German offensive in the Eastern 
Front during the early stages of World War I.