Ten days after Antietam, a young soldier from Wiconisco Township, PA sat down to put it into words for his father back home. Private Joseph Workman of the 96th Pennsylvania had just walked the battlefield days earlier. "I saw an awful sight," he wrote. "We had to move away from there on account of the stink." His letter, recently digitized by the Library of Congress, provides insights into what he witnessed at the Battle of South Mountain as well. Read the full story.