I found Finas on the Mo. State Archives enrolled with the Union 68th Reg. EMM in 1863 and also 64 but there is a line drawn through the second card.
Hope this link works

http://www.sos.mo.gov/archives/soldiers/details.asp?id=S300182&conflict=Civil%20War&txtName=stevens,&selConflict=Civil%20War&txtUnit=&rbBranch=Army/Marine#

Elmer