I found this on here:
http://www.genealogytrails.com/ill/fulton/85th_ill_inf_chapter_32.html

CORPORAL NATHAN KELLOGG, aged eighteen, farmer; enlisted from Pekin, was chosen corporal at the organization of the company and served until severely wounded at the battle of Peach Tree creek, Georgia, July 19, 1864. He fell into the hands of the enemy and died at Griffin, Ga. His remains are buried at No. 4249 in the national cemetery at Marietta, Ga. He, too, was erroneously reported as mustered out with the regiment.