First Battle of the Masurian Lakes
The First Battle of the Masurian Lakes was a German offensive in the Eastern Front 2–16 September 1914, during the Russian invasion of East Prussia. It took place only days after the Battle of Tannenberg where the German Eighth Army encircled and... Wikipedia
Dates: Sep 2, 1914 – Sep 14, 1914
Result: German victory: Russian ejection from East Prussia
Location: East Prussia, Masurian Lake District, and Poland