
From Library of Congress:
Summary: Photo shows a makeshift field hospital with wounded soldiers sitting and lying on the ground while some receive care. Includes the straw-hatted Sixteenth New York Infantry who fought at Gaines’ Mill on June 27. Most were captured when Confederates overtook the area during the battle of Savage’s Station on June 29. (Source: Bob Zeller, Civil War in Depth, v. 1, p. 34)
Photographed by James F. Gibson
Civil War Photograph Collection. Library of Congress Prints and Photographs Division Washington, D.C.
Record page for this image: http://www.loc.gov/pictures/item/2011646181/
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Note: I used a photo editor to correct for fading, crop, and digitally enhance the image.

From Library of Congress:
Title: Battle of Friday on the Chickahominy
- Signed lower right: A.R. Waud.
- Title inscribed upper left.
- Inscribed above image: Porter, McCall, Slocum, Sykes, and Sumner attacked by a superior force of the rebels under Jackson and Lee.
- Published in: Harper’s Weekly, July 26, 1862, p. 468.
- Date Created/Published: [1862 June 27]
- Medium: 1 drawing on light brown paper : pencil and Chinese white ; 25.9 x 36.3 cm. (sheet).
- Part of Morgan collection of Civil War drawings. Library of Congress Prints and Photographs Division Washington, D.C.
- Record page for this image: http://www.loc.gov/pictures/item/2004661190/

(Above image is cropped from the original, on right.)
From Library of Congress:
Shelling the rebel works on the Chickahomy [sic] across the Mechanicsville bridge
Artist: Alfred R. Waud.
[1862] June [26]
1 drawing on white paper : pencil ; 20.3 x 25.5 cm. (sheet).
- Title inscribed below image.
- Inscribed above image: Shell exploding; Division same as in [ ] Junction; Use this for foreground make figures larger ; shell; June; Sheppard.
- Inscribed within image: Peach Tree; 10 Pn Parrot.
Part of Morgan collection of Civil War drawings. Library of Congress Prints and Photographs Division Washington, D.C.
Record page for this image: http://www.loc.gov/pictures/item/2004661049/

From Library of Congress:
Fair Oaks, Va., vicinity. Capt. James M. Robertson (third from left) and officers.
June 1862
Photographed by James F. Gibson
Photograph from the main eastern theater of war, the Peninsular Campaign
Civil War glass negative collection. Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA
Record page for this image:
From Wikipedia:
Officers of Combined Batteries B & L, 2nd U.S. Artillery. L-R: Wilson, Vincent, Robertson, Woodruff.
The Horse Artillery Brigade of the Army of the Potomac was a brigade of various batteries of horse artillery during the American Civil War.
Made up almost entirely of individual, company-strength batteries from the Regular Army’s five artillery regiments, the Horse Artillery operated under the command umbrella of the Cavalry Corps. The Horse Artillery differed from other light artillery (also known as “mounted” artillery) in that each member of the unit traveled on his own horse, rather than the traditional light artillery practice of some riding horses, while others rode on the limbers and caissons, with still others traveling on foot.

Civil War envelope showing Columbia with shield and American flag and White House
Addressed to Mr. James G. Blauvelt, Nanuett Post Office, Rockland County, New York; postmarked; bears 3 cent stamp.
Collection: Liljenquist Family Collection of Civil War Photographs (Library of Congress)
Date Created/Published: N.Y. : C. Magnus, 12 Frankfort St. ; 1862 June 22.
This envelope and additional information may be found here at the Library of Congress

From Library of Congress:
Title: Seven Pines, Va. Twin houses on battlefield, with 32-pdr. field howitzer in foreground.
(Note — the title description of the artillery piece is likely wrong. Please see first comment below.)
June 1862
Photographer: George N. Barnard
Photograph from the main eastern theater of war, the Peninsular Campaign
Civil War glass negative collection. Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA
Record page for this image: http://www.loc.gov/pictures/item/cwp2003000069/PP/

From Library of Congress:
Caption from negative sleeve: Major Robertson’s Battery of horse Artillery, near Richmond, June 1862.
Photographed by James F. Gibson
Photograph from the main eastern theater of war, the Peninsular Campaign
Civil War glass negative collection. Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA
Record page for this image: http://www.loc.gov/pictures/item/cwp2003005952/PP/
Wikipedia:
The Horse Artillery Brigade of the Army of the Potomac was a brigade of various batteries of horse artillery during the American Civil War.

Officers of Battery C, 3rd U.S. Artillery. L-R: Meinell, Gibson, Pendleton, and Fuller. (names from Wikipedia)
Wikipedia:
The Horse Artillery Brigade of the Army of the Potomac was a brigade of various batteries of horse artillery during the American Civil War.
From Library of Congress:
Title: Fair Oaks, Va., vicinity. Capt. Horatio G. Gibson (second from left) and officers of his battery
June 1862
Photographed by James F. Gibson
Photograph from the main eastern theater of war, the Peninsular Campaign
Civil War glass negative collection. Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA
Record page for this image: http://www.loc.gov/pictures/item/cwp2003000081/PP/