The Fred Denig (Ferdinand?) I am searching for came to the U.S. because he did not want to serve in the German Army among other things & then was faced with the Civil War here, according to Denig family in Wisconsin. In my search for Civil War soldiers @ Ancestry.com I found a record for a Ferdinand Denig with an enlist date of 10-8-1864 @ age 22. It stated that he served as a Substitute G CO. 15th Inf Reg.OH. Discharged 6-8-1865 & detached with Army of the Tennessee. I do not know what Substitute means & was unable to find any further info. I will now check out the 1880 & 1910 Census for Marion County,Ohio at your suggestion for further possible clues. Thank you so much for your response and help.