There it is, in all its gory glory:
At Torquay’s Town Hall hospital, she cared for the seriously wounded, assisted in operations and cleaned up after amputations. “I would wash [away] all the blood,” she later wrote, “and stick [the limb] in the furnace myself.”
'She' in the text here is Agatha Christie. She was a volunteer nurse during the first World War and an apothecary’s assistant during the second World War. Such experiences obviously influenced her writing, especially the use of poison for the murders in her books. A great read on the Guardian.