The final aggregate tally of conscription numbers was telling and revealed the depth of Northern war-avoidance sentiment. Of the more than 776,000 men eventually drafted by the federal government between July 1863 and April 1865, a mere six percent were actually held to service. More than 160,000 men – or roughly 21 percent of those drafted – simply refused to report to their draft boards for examination, making them deserters by choice and law. The remainder paid the commutation fee, hired a substitute, or gained some manner of medical exemption.
A known fact I didn't know about.