At the outbreak of World War II, Schmidt was first assigned to a Waffen-SS military hospital.
Between March 1945 and early April 1945, Schmidt served as camp physician in the Boelke Kaserne subcamp of Mittelbau-Dora in Nordhausen.
[2] Near the end of World War II, in the course of the evacuation of staff and prisoners from the Mittelbau, Schmidt wound up at Bergen-Belsen concentration camp on 8 or 9 April 1945.
At this time, he was serving as senior doctor in the Bergen-Belsen displaced persons camp set up by the Allies.
[3] Schmidt was again indicted and stood trial at the District Court of Düsseldorf for war crimes committed at Majdanek concentration camp.