" Civil War armies were the most literate in history to that time. More than 90 percent of white Union soldiers and more than 80 percent of Confederate soldiers were literate, and most of them wrote frequent letters to families and friends... I am convinced that [their letters and diaries] bring us closer to the real thoughts and emotions of those men than any other kind of surviving evidence. "

― James M. McPherson , For Cause and Comrades: Why Men Fought in the Civil War