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.
 

Union Soldiers of the 43rd New York Volunteer Infantry Regiment Posing in Camp Griffin Near Lewinsville, Virginia

Union soldiers of the 43rd New York Volunteer Infantry Regiment standing at attention in Camp Griffin near Lewinsville, Virginia. Animated stereoview.

Source.

Three Views of Union Soldiers Posing in Front of a Lean-to Shelter During the Civil War Near Lewinsville, Virginia (1861)

"Picket guard on the alert, near Lewinsville, Va." Source.

"Picket guard, Lewinsville, Va." Civil War-era colorization of the same stereoview with a different caption. Source.

Higher resolution version of the scene. Source.

"Picket guard on the alert, near Lewinsville, Va." Union soldiers in front of a lean-to shelter posing as if they were fighting in a skirmish, 1861. By Edward Bierstadt. Animated stereoviews. Later used as a reference for his brother Albert Bierstadt's painting seen here:

"Guerrilla Warfare," by Albert Bierstadt, 1862. Source.

I have come across at least two other versions of Union soldiers posing in front of the shelter by Edward Bierstadt. The following stereoview is from Lincoln in Photographs: An Album of Every Known Pose.

"Picket Guard at rest near Lewinsville, Va." Another scene of Union soldiers posing in front of the shelter.

The third is said to show Union soldiers guarding Confederate POWs in front of the shelter.

"Picket Guard with Prisoners Near Lewisville." The resolution of the photograph is too low to tell whether or not the "Lewisville" caption is misspelled. From Cowan's Auctions. Source.