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 Battle of Gettysburg is rated as the bloodiest battles of the Civil War. Although the battle prevailed for only 3 days, it left behind traces of trauma that could be witnessed in the town for years to come.