Mary Fields was born a slave in Tennessee, but little else is known of her early life. Some historical accounts have placed her on the Mississippi River in the early 1870s, and at least one researcher claims that she was a passenger on the Robert E. Lee when it raced the steamer Natchez in June 1870. By 1884 Fields was living in Toledo, Ohio, where she worked as a handywoman for an order of Ursuline nuns. She became attached to the mother superior of the convent, Mother Amadeus, who is variously reported as a close friend or as the master in a master-servant relationship. Shortly after Fields arrived at the convent, Mother Amadeus left for Montana to open a school for Blackfeet Native American girls. When Mother Amadeus fell ill in Helena, Fields came to her aid and decided to stay in Montana.
Fields assisted the Catholic mission ...