Marschall worked as
Oberschwester at
Ravensbrück concentration camp from April 1943 until the camps liberation, where her duties included selecting prisoners for execution, overseeing
medical experiments, and selecting around 800 prisoners to be shipped to
Auschwitz. She worked with
Adolf Winkelmann and Percival Treite, assisting in torture of prisoners and providing postoperative care to the subjects of their experimental operations. Mil Le Coq, a French trained nurse, reported an incident with Marschall, recounted in
The Scourge of the Swastika: A Short History of Nazi War Crimes: == Trial ==