The Silesian Offensive was a Russian

Russian Empire

The Russian Empire was a state that existed from 1721 until the Russian Revolution of 1917. It was the successor to the Tsardom of Russia and the predecessor of the Soviet Union...

 offensive in 1914, during the First World War. It lasted from November 11 till December 6, and consisted of the battle of Łowicz and battle of Łódź. While it marked the furthest Russian forces would ever get to the West during the war, it was a tactical Russian victory - but their strategic defeat.