I guess this is him:
Company C, Twelfth Kentucky Cavalry, CSA.
Cashion, J.: Pvt.; enlisted 2/1/64 in West TN; deserted at Huntingdon, TN 4/25/64.

What is his full name, dates and places of birth and death, and full names of parents and wife?

Appomattox just marked the surrender of the Army of Northern Virginia. The Confederate government had not surrendered, as also there were other Confederate forces across the South still in the field.

Thanks

Greg