Mac Wyckoff is a retired National Park Service historian who served at the Shiloh, Chickamauga, and Fredericksburg National Military Parks for forty years. He is the author of A History of the 2nd South Carolina Infantry, 1861-1865 and A History of the 3rd South Carolina Infantry, 1861-1865 and co-author of The Legacy of a Common Civil War Soldier: Private Thomas Marion Shields, A Collection of 34 Letters, 1861-1865.