Born in Lexington, Massachusetts to Elias and Catherine Bartlett Phinney, a lawyer and her mother the daughter of a doctor, Phinney was well educated at several academies.
When her father died in 1849 at age 69, the farm was sold and she "sought employment as a designer of print goods" at the Manchester Mills company in Massachusetts.
Baron Gustav Adolph von Olnhausen (born in 1809)[3] left Saxony after the German revolutions of 1848–1849 and also due to financial troubles, which led him to sell of his property. In the 1850s He was making a meager living as a chemist in a dye-house of the Manchester Mills, where he met Mary Phinney.
They married on May 1, 1858 (she was 40 years old at the time) and he died two years later in 1860.[4]
With the outbreak of the Franco-Prussian War in 1870, she volunteered to serve as a nurse with the Prussian Army and was accepted on the basis of being the Baroness von Olnhausen. She served in field hospitals in Meung and Vendome.
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Stanley B. Burns (2015). "Behind the Lens: A History in Pictures". PBS Masterpiece Theatre. Retrieved 2016-01-18. Nurses, both Union and Confederate, wrote memoirs of their experiences providing an intimate and personal look at the war from varied points of view. Mary Phinney von Olnhausen's (1818-1902) "Adventures of an Army Nurse in Two Wars" gives a glimpse into the life of a Union nurse and was an inspiration for Mercy Street.
^Baptism entry Gustav Adolph von Olnhausen in the baptismal register of the parish of St. Marien Zwickau. Baptismal register of the parish St. Marien Zwickau 1801–1818, year 1809, p. 225, no. 11. Central (micro-)film register (Zentrale Lesestelle) of the Ev.-Luth. Landeskirche Sachsen, Regional Church Office Dresden.
^Uwe Brückner, ed. (2007-05-01). "Das preußische Verdienstkreuz für Frauen und Jungfrauen". Ordensjournal. 8. Berlin: 24. Reprint of Das Verdienst-Kreuz für Frauen und Jungfrauen, hrsg. v. L. Schneider, Verlag Alexander Duncker, Berlin 1872 pdf
^Pamela D. Toler (2016), Heroines of Mercy Street: The Real Nurses of the Civil War, Little, Brown, and Company