Photo of African American Union Soldiers of the 107th Regiment United States Colored Troops in Fort Woodbury, in Arlington, Virginia (1865)

 

Photo of black Union soldiers of Company E of the 107th Regiment United States Colored Troops posing with their muskets in front of a building in Fort Woodbury in Arlington, Virginia, November 1, 1865. Taken by photographer William Morris Smith for Alexander Gardner.

Source: New York Public Library.

More information from Military Images.

Photo of Union Soldiers of the 7th New York State Militia Regiment Posing in Front of a Building During the American Civil War (1860's)

 

Photo of Union soldiers of the 7th New York State Militia Regiment posing in front of a building during the American Civil War, location unknown, c. 1861-1863. Two black civilians and another soldier can be seen peering out of windows/doors on the first floor of the building.

Source: J. Paul Getty Museum.

Photo of Union Army Cooks of the 43rd New York Infantry Regiment Preparing a Meal in Camp Griffin in Lewinsville, Virginia (1861-1862)

"Culinary art in Camp, 43rd Reg. N.Y. Volunteers." Photo of Union Army cooks of the 43rd New York Infantry Regiment preparing a meal in Camp Griffin in Lewinsville, Virginia, c. 1861-1862. Taken by photographer Charles Bierstadt and originally published as a stereoview. The lattice fence seen in the background of this looks quite similar to the one in the photo of the "hotel" building at Camp Griffin taken by George Houghton, so I surmise this kitchen scene might have been taken nearby, maybe even on the same property.

Source: New York Public Library.
 

Photo of Union Soldiers of the 13th Vermont Volunteer Infantry Regiment in Their Winter Camp in Wolf Run Shoals, Virginia (1863)

 

Photo of Union soldiers of the 13th Vermont Volunteer Infantry Regiment in their winter camp in Wolf Run Shoals, Virginia, early in 1863. From the book Pictorial History Thirteenth Regiment Vermont Volunteers War of 1861-1865 published in 1910.

Source: Library of Congress. 

Photo of a Review of Union Soldiers of the 6th Massachusetts Volunteer Militia Regiment on the South Common in Lowell, Massachusetts, During the American Civil War (1860's)

 

Photo of Union soldiers of the 6th Massachusetts Volunteer Militia Regiment and civilians on the South Common in Lowell, Massachusetts, c. 1861-1864. Taken by photographer Simon Towle and originally published as a stereoview. The caption on the back of the stereoview is: "May training on South Common, jail in distance, 7 companies of the 6th Regiment Volunteers." The city's jail is prominently featured in the background at center.

Source: New York Public Library.

Photo of a Group of Armed Union Soldiers Posing in Front of a Barracks Building During the American Civil War, Location Unknown (1860's)

 

Portrait of a group of armed Union soldiers posing in front of a barracks building during the Civil War, location unknown, c. 1860s.

 Source: Missouri Historical Society.

Photo of Union Soldiers of the 6th Massachusetts Militia Regiment Posing in Battle Monument Square in Baltimore, Maryland (1861)

Portrait photo of Union soldiers of the 6th Massachusetts Militia Regiment posing in front of the War of 1812 Battle Monument in Battle Monument Square in Baltimore, Maryland, July 1, 1861. Attributed to photographer William Weaver. I think it is a possibility that using a studio portrait lens to take this outdoor photograph caused the edges of it to look so out of focus.

Source: Library of Congress.

"President Lincoln's Guard" Photo of Union Soldiers and Civilians Posing in Front of a Union Army Encampment in Washington DC (1861)

 

"President Lincoln's Guard." Photo of a large group of Union soldiers and civilians posing in front of a Union Army encampment probably near the White House in Washington, D.C., 1861. Attributed to Titian Ramsay Peale.

Source: National Museum of American History.

Photo of Union Soldiers of the Fitchburg Fusiliers in Front of the Rollstone House in Fitchburg, Massachusetts, Before Leaving to Fight in the Civil War (1861)

 

Portrait of Union soldiers of the Fitchburg Fusiliers in front of the Rollstone House in Fitchburg, Massachusetts, 1861. The photo was taken shortly before they left to fight in the Civil War as Company B of the 15th Massachusetts Infantry Regiment. Attributed to J. C. Moulton. From the book Fitchburg Past and Present by William Andrew Emerson published in 1903.

View of a Parade of Zouaves and Other Soldiers on Broadway in Baltimore, Maryland, Taken a Few Years After the Civil War (1868)

  

 

View of Zouaves and other soldiers during a parade along Broadway in Baltimore, Maryland, c. 1860s. Attributed to photographer William Chase. The wagon seen at right is possibly a military one. Originally published as a stereoview. NYPL dates this photo to 1880, but I think it was taken much earlier.

Update: Posts by Ross Kelbaugh and Ron Field on Facebook seem to date this photo to 1867 or 1868. The 6th Maryland Regiment is wearing the Zouave uniforms while the 5th Maryland Regiment (visible in the distance) is wearing gray uniform.

Source: New York Public Library.

View of the Winter Camp of the 2nd Regiment of Cavalry, Massachusetts Volunteers on Ayr Hill in Vienna, Virginia, During the American Civil War (1863-1864)

View of the winter camp of the 2nd Regiment of Cavalry, Massachusetts Volunteers on Ayr Hill in Vienna, Virginia, during the American Civil War, c. 1863-1864. From the book Field, Camp, Hospital and Prison in the Civil War, 1863-1865 by Charles A. Humphreys published in 1918.

Source: California Digital Library.

Portrait of Union Soldiers of the 39th Illinois Volunteer Infantry Regiment Posing With a Billinghurst Requa Battery Rapid-Fire Gun on Morris Island, South Carolina (1863)

Portrait of Union soldiers of the 39th Illinois Volunteer Infantry Regiment posing with a Billinghurst Requa Battery rapid-fire gun on Morris Island, South Carolina, 1863. The gun was under command of Lieutenant Wheeler and Lieutenant Kingsbury, who are presumably the two officers posing on the left. Probably taken by the photography firm of Haas and Peale. From the book The History of the Thirty-Ninth Regiment Illinois Volunteer Veteran Infantry. (Yates Phalanx.) in the War of the Rebellion 1861-1865 by Charles M. Clark.

Billinghurst Requa Battery gun Wikipedia entry.

Union Soldiers and Civilians Posing in an Encampment and On the Ruins of the Morris Island Lighthouse Near Charleston, South Carolina, During the American Civil War (1863)

Union soldiers and civilians posing in an encampment and on the ruins of the Morris Island Lighthouse near Charleston, South Carolina, during the American Civil War in July or August 1863. Some of the men on the pile of rubble are possibly watching distant exchanges of artillery fire by Union and Confederate forces in Charleston Harbor. By photographers Haas and Peale.

Source: Library of Congress.

Union Soldiers Loading a 15-inch Rodman Gun in Fort Warren on Georges Island at the Entrance to Boston Harbor in Massachusetts During the American Civil War (1864)

Union soldiers loading a 15-inch Rodman gun in Fort Warren on Georges Island at the entrance to Boston Harbor in Massachusetts during the American Civil War, 1864. By James Wallace Black.

Source: Boston Public Library.

View of Abraham Lincoln’s Funeral Procession Consiting of Union Soldiers, Musicians, And Others Wearing Civilian Clothing on Pennsylvania Avenue (1865)

View of Abraham Lincoln’s funeral procession consiting of Union soldiers, musicians, and others wearing civilian clothing on Pennsylvania Avenue, April 19, 1865. Attributed to Mathew Brady.

Source: Library of Congress.

A Group of Union Soldiers and Civilians Posing on a Rebuilt Railroad Trestle Bridge Over Bull Run Near Manassas, Virginia, During the American Civil War (1863)

A group of Union soldiers and civilians posing on a rebuilt railroad bridge over Bull Run near Manassas, Virginia, during the American Civil War, 1863. Attributed to Mathew Brady.

Source: National Archives and Records Administration.
More information.

A Group of Union Soldiers and Civilians Posing in Front of the Office of Provost Marshall Department of the Cumberland in Chattanooga, Tennessee, During the American Civil War (1860's)

A group of Union soldiers and civilians posing in front of the Office of Provost Marshall Department of the Cumberland in Chattanooga, Tennessee, during the American Civil War, location unknown, c. 1861-1865. Attributed to Mathew Brady.

Source: National Archives and Records Administration.
Additional information: Library of Congress.

Union Soldiers at Bayonet Drill in a Camp During the American Civil War (1860's)

Union soldiers at bayonet drill in a camp during the American Civil War, c. 1861-1865. Attributed to Mathew Brady.

Source: National Archives and Records Administration.

Union Soldiers and Civilians Posing on the US Sanitary Commission Hospital Steamer Named Red Rover During the American Civil War (1860′s)

Union soldiers and civilians posing on the US Sanitary Commission hospital steamer named Red Rover during the American Civil War, c. 1860′s.

Source: New York Public Library.

Portrait of Union Soldiers of the 56th Massachusetts Volunteer Infantry Regiment Playing a Game of Cards in a Camp During the American Civil War (1860′s)

Portrait of Union soldiers of the 56th Massachusetts Volunteer Infantry Regiment playing a game of cards in a camp during the American Civil War, c. 1860′s. From the book War Diary and Letters of Stephen Minot Weld, 1861-1865 published in 1912.