On this day 110 years ago, on February 21, 1915 (January 8, 1915), the second battle of Lake Masuriane ended. On February 21, 1915, Russia attacked German East Prussia at the request of France. The army waved forward without assembling well. As a result, it was defeated by the German 1st Corps at Lake Masuriane and 100,000 the army became captives. Captured Russian soldier