The National Archives contain many pictures - mostly of Union soldiers. What follows is a representative sampling:

• An Army battery stands at drill in Ringgold, Georgia.
  
  
• Company "H" of the 44th Indiana Infantry.
  
  
• 2nd Maine Infantry at a camp site.
  
  
• The 2nd Massachusetts Heavy Artillery created "havoc" with a 32-pound shell at Fredericksburg, Virginia.
  
  
• Company of 21st Michigan Infantry - also called "Sherman’s Veterans."
  
  
• Members of the 21st Michigan Infantry.
  
  
• A Regimental Drum Corps.
  
  
• 114th Regiment of the Pennsylvania Volunteers - at Headquarters for the Army of the Potomac. 1863.
  
  
• Army engineers, from the 8th New York State Militia, pose in front of a tent.
  
  
• Company "E" of the 22nd New York State Militia, near Harpers Ferry, Virginia. (Harpers Ferry, where the Shenandoah and Potomac Rivers converge, is now in the state of West Virginia.)
  
  
• Captain Otis and the 22nd New York Infantry at Maryland Heights, Harpers Ferry.
  
  
• Officers of the 164th and 170th New York Infantry.
  
  
• Flag of the 8th Pennsylvania Reserves.
  
  
• At Camp William Penn, Pennsylvania, the 26th U.S. "Colored Volunteer Infantry" was on parade.
  
  
• Headquarters of "F" Company, 11th Rhode Island Infantry, at Miners Hill, Virginia.
  
  
• Men in the trenches before Petersburg, Virginia.
  
  
• Battery Rodgers, a fort on the Potomac River, below Alexandria.
  
  
• Federal troops build a bridge across the Tennessee River at Chattanooga in March of 1864.
  
  
• Sailors and Marines on board the U.S. gunboat Mendota in 1864.
  
  
• Men aboard the CSS Manassas, an armored ram.
  
  
• Wounded soldiers, in the hospital, at a time when morphine was widely used for pain. (At the end of the war over 400,000 men had "Army Disease" - morphine addiction.)
  
  
• Amputations in the field were more common than most people realize.
  
  
• Interior view of Carver Hospital, Washington, D.C.
  
  
• Convalescent camp near Alexandria, Virginia.
  
  
• When a military tour of duty was finished, the soldier was discharged. Follow the link to an example of a Civil War Discharge from February, 1863.