For instance, the following three records are likely the same person:
Adair, John C Private
3rd Regiment Florida Infantry
Confederate
Adair, John A. C
Sergeant
Private
3rd Regiment Florida Infantry
Confederate
Adaire, John C.
Sergeant
Private
3rd Regiment Florida Infantry
Confederate
Official records state that the actual number of soldiers is likely to be more like abt. 16,000 fighting for the Confederates while abt. 2,000 fought for the Union.