 However, after four days, during which she was said to have been subjected to attempted rape by English soldiers, she put her soldier's clothing back on because (according to the eyewitnesses) she needed protection against rape.Cauchon declared her a relapsed heretic, and she was burned at the stake two days later on 30 May 1431.In 1455, a petition by Joan of Arc's mother Isabelle led to a re-trial designed to investigate the dubious circumstances which led to Joan's execution.