First Battle of the Masurian Lakes (7 sept. 1914 – 14 sept. 1914)

Description:

The First Battle of the Masurian Lakes was a German offensive in the Eastern Front during the early stages of World War I. It pushed the Russian First Army back across its entire front, eventually ejecting it from Germany. Further progress was hampered by the arrival of the Russian Tenth Army on the Germans' left flank.