 During the "Kristallnacht" in 1938, the Germans destroyed the synagogue.During World War II the Germans established a women's subcamp of the Gross-Rosen concentration camp, 11 forced labour camps and 4 labour units of the POW camp in Żagań, intended for French, Italian and Soviet prisoners of war.The Soviet Red Army occupied Grünberg with little fighting on February 14, 1945 during World War II.