Company F, 7th Illinois Infantry on Point Lookout at Lookout Mountain, Chattanooga, TN, June 17, 1864.
https://bunkerhillhistory.blogspot.com/2014/12/company-f-7th-illinois-infantry.html
Another photo of soldiers from the 7th Illinois Infantry at Point Lookout on June 19, 1864.
http://www.loc.gov/pictures/collection/cwp/item/2013647890/
After the battle of Lookout Mountain was fought the mountain became a popular tourist attraction. Many soldiers and civilians had their photograph taken specifically on the rock in the photo, known as "Point Lookout." In Late 1863 Robert "Royan" M. Linn established a photo studio at Lookout Mt. and began taking numerous photos of soldiers and civilians on Point Lookout.
Article on him here:
http://antiquephotographics.com/the-perils-of-photography-at-point-lookout-r-m-linn/
History of the 7th Illinois Volunteer Infantry:
The 7th Illinois Infantry was first mustered in at Camp Yates, Springfield, Illinois on April 25, 1861. It would go on to serve at Fort Donelson, Shiloh, and Iuka-Corinth Campaign. Was mounted on donkeys June 18, 1863 and engaged in scout and patrol duty through West Tennessee till October, participating in numerous expeditions and skirmishes. Re-enlisted as Veterans at Pulaski, Tennessee, December 22, 1863, and was mustered in January 6, 1864. Was mounted again on Feb. 27, 1864 patrolled the Tennessee River in Florence, Alabama for Forrest's command, fighting numerous skirmishes. Was dismounted on June 14, 1864 and moved to Chattanooga, TN. Saw action in the Atlanta Campaign and probably their most famous action at Allatoona Pass. Took part in Sherman's March to the Sea. Participated in the Corolinas Campaign, fighting at Salkahatchie Swamp, Bentonville and Columbia. Was mustered out at Springfield, Illinois on July 11, 1865.
http://www.illinoisgenealogy.org/civil_war/7th_illinois_infantry.htm
A late war photograph of the color-gaurd of 7th Illinois Infantry, with their mascot, "Jefferson Davis."
The 7th Illinois was the largest regiment to purchase its own Henry Rifles, paying $52.50 each for them. They were armed with over 500 of them, which came in good use at Allatoona Pass, fighting at Rowett's Redoubt.