Carl,
I read that the 39th MO Infantry comrades of the mutilated Union soldiers that fought against Bill Anderson, George Todd, and all at Centralia on 27 September 1864 loaded the remains on a train at Mexico in Audrain County to be taken somewhere. Now, I would figure that the families of most of those men would take their loved one's remains to be buried at their various home cemeteries. However, it is possible that the men who had nobody to speak for their corpses were taken someplace not so far away and buried in a common grave with one stone to represent the several of them. Why couldn't that have been at Wellsville? Perhaps one of the 39th soldiers had a connection with the Wellsville cemetery or the town offered to take those men's bodies to inter in their graveyard. I could see how that could happen, and it could account for nine men of the same side buried from the same action. Also, Wellsville is the next or the second stop from Mexico heading east along the North Missouri Railroad. That gives us burial at Wellsville as a matter of convenience for their regiment, if you will forgive me for being crass.
Perhaps somebody else will come forth with more information for us.
Bruce Nichols