After World War I , Oels was included within the Province of Lower Silesia . It was heavily damaged by the Red Army in 1945 during World War II , having approximately 60-80 % of its buildings destroyed . The city was placed in Poland 's borders after the Potsdam Conference and its official name became Oleśnica . The remaining German-speaking population was subsequently expelled and resettled with Poles many of whom were expelled from Eastern Poland annexed in 1945 by the Soviet Union . The majority of monuments in the Old Town have been rebuilt since the 1960s
Potsdam Conference
Potsdam Conference
Oleśnica