mandelbug definition: Noun (plural mandelbugs) 1. (computing) A software bug whose behaviour appears to be chaotic. ...
The bloodiest single day of battle was Antietam (26,134 casualties). The bloodiest battle, however - which lasted three days - was Gettysburg (51,112 casualties). July 21, 1861.
The day of the Battle of Antietam (or Sharpsburg) on Sept. 17, 1862, was the single bloodiest day of the Civil War, and remains the single bloodiest day in American military history. More than 22,000 men fell that day, 3,654 of them killed outright.