Posted on April 20, 2015 by Ray Starmann Antietam: The Bloodiest Day in American History Civil War Trust Explore the Civil War Trust’s animated map of the Battle of Antietam, produced by Wide Awake Films. Learn more about this important Civil War battle in Maryland, the bloodiest day in American history. Share on Facebook Tweet Follow us Share Share Share Share Share Share this...emailFacebookPinterestTwitterLinkedinReddit Military History