The Gelsenberg Lager was a subcamp of the concentration camp Buchenwald in Gelsenkirchen-Horst. About 2000 Hungarian Jewish women were held in this subcamp, and were given the task of clearing the area of the Gelsenberg Benzin AG of rubble in the summer 1944. Approximately 150 of them were killed during heavy bombing attacks on the hydrogenation plant in September 1944. A few badly injured survivors were taken to Gelsenkirchen hospitals.