Abner Doubleday (June 26, 1819 – January 26, 1893) was a career United States Army officer and Union general in the American Civil War. In the 1870s, he was listed in the New York business directory as lawyer. Doubleday spent much of his time writing. He published two important works on the Civil War: Reminiscences of Forts Sumter and Moultrie (1876), and Chancellorsville and Gettysburg (1882), the latter being a volume of the series Campaigns of the Civil War.