George Rogers Clark (1752-1818) led four victorious campaigns against the Indians and British in the Ohio Valley during the American Revolution, but his most astonishing coup was recapturing Fort Sackville in 1779, when he was only twenty-six. For eighteen days, in the dead of winter, Clark and his troops marched through bone-chilling nights to reach the fort. With a deft mix of guile and violence, Clark led his men to triumph, without losing a single...