However, he soon left Sweden for Paris, where he joined the French Foreign Legion and saw service in the Franco-Prussian War.
[4] Thulstrup also served in the French part of Northern Africa as a member of the First Zouave Regiment.
[5] He moved to the United States in 1873,[6] where he became an artist for the New York Daily Graphic, and, later, Frank Leslie's Illustrated Newspaper, documenting local events.
[7] As his skills improved, he became able to move into more and more prestigious roles, including work for Century, Harper's Monthly, and Scribner's Magazine.
[6] His military pictures include a series of paintings depicting the American Civil War, and illustrations of a Virginian lifestyle in the middle of the eighteenth century.