Here are links to his index cards and a summary of Mo. units' service:

http://www.sos.mo.gov/archives/soldiers/details.asp?id=S132609&conflict=Civil%20War&txtName=graef&selConflict=Civil%20War&txtUnit=&rbBranch=all

http://www.sos.mo.gov/archives/soldiers/details.asp?id=S132619&conflict=Civil%20War&txtName=graf&selConflict=Civil%20War&txtUnit=&rbBranch=all

http://www.sos.mo.gov/archives/soldiers/details.asp?id=S132603&conflict=Civil%20War&txtName=gra&selConflict=Civil%20War&txtUnit=3&rbBranch=all

http://www.civilwararchive.com/Unreghst/unmoinf1.htm#13

St Louis death index lists his death Sep 8, 1878 and CW Pension Index shows that a pension was granted to his widow Barbara, certificate #368308(?) [date of application and certificate number are blurred]