Leander Stillwell was an 18-year-old Illinois farm boy, living with his family in a log cabin, when the U.S. Civil War broke out. Stillwell felt a duty “to help save the Nation;” but, as with many other young men, his Patriotism was tinged with bravura: “the idea of staying at home and turning over senseless clods on the farm with the cannon thundering so close at hand . . . was simply intolerable.” Stillwell volunteered for the 61st Illinois Infantry in January 1861. His youthful enthusiasm for the soldier’s life was soon tempered at Shiloh, where he first “saw a gun fired in anger,” and “saw a man die a violent death.”

Stillwell’s recounting of events is always vivid, pers...