The American Civil War claimed the lives of 750,000 Americans. Death and mourning defined the four wrenching years between 1861 and 1865, leaving an indelible imprint on the nation at large. During these years, photography became a powerful tool of reportage and remembrance: "the field of photography is extending itself to embrace subjects of strange and sometimes of fearful interest," wrote Oliver Wendell Holmes in reference to a haunting series...