After World War II , Waldenburg became part of Poland under border changes demanded by the Soviet Union at the Potsdam Conference . Many of the Germans living in the city fled or were forcibly expelled , and the city was renamed Wałbrzych . Wałbrzych was one of the few areas where a number of Germans were held back as they were deemed indispensable for the economy , e.g. coal mining . An ethnic German society has been maintained in Walbrzych since 1957
Potsdam Conference
Potsdam Conference
Wałbrzych