In April 1863--after the Dakota War of 1862, after the hanging of thirty-eight Dakota men in the largest mass execution in U.S. history-- some 270 Dakota men were moved from Mankato, Minnesota, to a prison at Camp McClellan in Davenport, Iowa. Separated from their wives, children, and elder relatives, with inadequate shelter, they lived there for three long, wretched years. More than 120 men died. Desperate to connect with their families, many of...