When Ainsworth's staff completed the project, there were 6.3 million General Index Cards for the soldiers - both Union and Confederate - who had served during the American Civil War. Historians have determined that approximately 3.5 million soldiers actually fought in the War. A soldier serving in more than one regiment, serving under two names, or spelling variations resulted in the fact that there are 6.3 million General Index Cards for 3.5 million soldiers. Data from all 6.3 million cards is in the CWSS. SEQUENCE OF RECORDING SOLDIERS NAMES FROM THE CIVIL WAR TO THE CWSS.