In 2002, Judy Cook discovered a packet of letters written by her great-great-grandparents, Gilbert and Esther Claflin, during the American Civil War. An unexpected bounty, these letters from 1862-63 offer visceral witness to the war, recounting the trials of a family separated. Gilbert, an articulate and cheerful forty-year-old farmer, was drafted into the Union Army and served in the Thirty-Fourth Wisconsin Infantry garrisoned in western Kentucky along the Mississippi. Esther had married Gilbert when she was fifteen; now a woman with two teenage sons, she ran the family farm near Oconomowoc,...