I do thank you for the correction.
I confused "Casualties" with "Deaths".
620,000 is a good estimate for "Deaths", but in the campaign from Wilderness to Cold Harbor, the South no longer collected casualty numbers. That hinders accurate study. The Southern commanders also didn't collect much data on the number of their soldiers that they murdered themselves to keep them from returning to their homes. That difference in record keeping helps perpetuate the myth of loyal southern units.
And usually, when applying a tolerance value, it is plus or minus, which means that the number killed could actually be quite lower.
The Southern commanders also didn't collect much data on the number of their soldiers that they murdered themselves to keep them from returning to their homes
Please cite historical data to support this biased allegation.
Of course, when yankee soldiers were caught for desertion, they were properly executed, not murdered in cold blood, right Cindy?