Millard Fillmore

• Millard Fillmore was the 13th president of the United States.National Archives/Getty Images News/Getty Images
  
  Millard Fillmore, the 13th president of the United States, held the office from 1850 until 1853. He came to office upon President Zachary Taylor's death on July 9, 1850. When the war broke out in 1861, Fillmore was appointed as major of the New York militia.
  
  

Andrew Johnson

• Andrew Johnson was the 17th president of the United States.National Archives/Getty Images News/Getty Images
  
  Andrew Johnson became president following the assassination of Abraham Lincoln in 1865. He served in the post of president until 1869. In 1862, while Johnson was still vice president, President Lincoln appointed him to the post of military governor over the captured southern state of Tennessee.
  
  

Ulysses S. Grant

• Ulysses S. Grant was the 18th president of the United States.Photos.com/Photos.com/Getty Images
  
  Ulysses S. Grant served as president between 1869 and 1877. At the outbreak of the Civil War, he was appointed by the governor of Illinois to command a local volunteer regiment. He distinguished himself greatly as a leader and by the end of the war had risen to the rank of brigadier general of volunteer troops.
  
  

Rutherford B. Hayes

• Rutherford B. Hayes was the 19th president of the United States.National Archives/Getty Images News/Getty Images
  
  Rutherford B. Hayes served as president from 1877 to 1881. He entered the army at the outbreak of war and was wounded in action. He ultimately rose to the rank of brevet major general. His political career began before he had even left the army when he was nominated in Cincinnati for the House of Representatives.
  
  

James A. Garfield

• James A. Garfield was the 20th president of the United States.Photos.com/Photos.com/Getty Images
  
  James A. Garfield served as president from March to July of 1881, when he was shot at a railroad station in Washington. He was not killed outright, but finally succumbed to his injuries in early September. In 1862, Garfield led a brigade of soldiers to victory against a confederacy force in Kentucky. He ultimately attained the rank of major general by the time the war ended.
  
  

Chester A. Arthur

• Chester A. Arthur was the 21st president of the United States.National Archives/Getty Images News/Getty Images
  
  Chester A. Arthur was vice president to James A. Garfield and took over office upon his death in 1881, serving until 1885. During the Civil War, Arthur served in New York as quartermaster general.
  
  

Benjamin Harrison

• Benjamin Harrison was the 23rd president of the United States.National Archives/Getty Images News/Getty Images
  
  Benjamin Harris served as president from 1889 to 1893. In 1862, as a staunch supporter against slavery, he accepted a commission from the governor of Indiana as a second-lieutenant. He rapidly climbed the ranks and ended the war as brigadier general.
  
  

William McKinley

• William McKinley was the 25th president of the United States.Photos.com/Photos.com/Getty Images
  
  William McKinley served as president from 1897 until 1901. He entered the union army as a private at the outbreak of the Civil War and distinguished himself in his service. At the end of the war, he had reached the rank of brevet major of volunteers.