Union XII Corps
  
 
 
 

      General Joseph K. Mansfield                      General Henry Warner Slocum                General Alpheus S. Williams                     General John W. Geary

  
 

Battle of Cedar Mountain and Manassas


History of the Twelfth Corps, Cedar Mountain and Manassas

Source: Fox, William F. In Memoriam: Henry Warner Slocum. Albany, NY: J. B. Lyon, 1904. Also known as Slocum and His Men: The Twelfth Corps.