Evelyn,

He DOES have a Union Veteran's Pension Application filed in Tennessee in 1907. He appears to have not been affiliated with an individual unit, but his service is listed as "Comy Sub US Vols" (Commissary of Subsistence, United States Volunteers). BTW, there is also a Horace Vandeventer who was a Captain in the 6th U.S. Vols, Quartermaster Corps and what looks like, "Capt., Finance Dept, USA". He also applied for a Union pension in Tennessee.

Of course, you can order these files through the link below.

Jim