He held his position there until 1944, when the Allied military forces liberated Strasbourg from German occupation. From 1944 to 1945, he was at Walther Bothe's Institut für Physik (Institute for Physics) of the Kaiser-Wilhelm Institut für medizinische Forschung in Heidelberg.Hentschel and Hentschel, 1996, Appendix F; see the entry for von Droste.
