A Joseph Wells was also Captain of Co F of the 41st EMM in Andrew Co from July 1862 to April 8, 1863. Perhaps the same one who Kirby notes was a PVT in 1864 and probably the same one who joined the 51st volunteer infantry in 1865 as a lieutenant. ???
Colonel, you can find some info at Missouri Digital Heritage, Soldier's Records: War of 1812 to World War I--a great searchable database.
If your ancestor was Joseph M. Wells b. 1830 in Indiana, I guess you are aware of his citation on Find-a-Grave.