In 1914 during World War I the German Army under the command of General Paul von Hindenburg won an important victory over the Russian Imperial forces invading East Prussia in the Battle of Tannenberg. The combat lasted from 26 to 30 August and actually included a wide range of battlegrounds centered on Olsztynek, then known as "Hohenstein". It was, however, named after nearby "Tannenberg" by the victorious Germans at Hindenburg's request, for propaganda purposes and to cast it as a kind of revenge for the medieval defeat. In 1934 von Hindenburg's funeral occurred there. In World War II, the Tannenberg myth lent the name to the German "Operation Tannenberg" extermination actions directed at the Polish people, while the Battle of Tannenberg Line refers to an Eastern Front campaign which took place in Estonia.