During the German invasion of Poland, which started World War II, the Wehrmacht entered Będzin on September 4, 1939, and in the following days the Germans committed the first atrocities in the city. On September 6, the Germans murdered 20 Poles, and on September 9, they murdered 100 Jews, set fire to the synagogue and Jewish houses, and then in attempt to blame the Poles they arrested and executed 42 Poles. Local Polish parish priest rescued a group of Jews who escaped the German massacre by opening the gates of the Holy Trinity church to them and giving them shelter. The German police carried out mass searches of Polish houses. Inhabitants of Będzin were also among Poles murdered in Celiny in June 1940. The Będzin Ghetto was established by the German occupational authority in July 1940. During the occupation, the city's name was changed to a German form, "Bendsburg", and it was part of Upper Silesia Province, as the capital of "Landkreis Bendsburg".