Of the five men you list, only one has amplifying information in the CW Research Database.
This should eliminate one of them.
George Martin
James Maraus Scott
Residence was not listed;
Enlisted as a Private (date unknown).
He also had service in:
"F" Co. MO 12th Cavalry
Other Information:
died in 1936 in Marion County, OR
Buried: Halbert Baptist Cemetery, Salem, Marion County, OR
After the War he lived in Marion County, OR
Sources used by Historical Data Systems, Inc.:
- Index to Compiled Military Service Records
- Research by Harold Slavik