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.
Over 23,000 men fell as casualties in the one-day Battle of Antietam, making it the bloodiest day in American history. The Union victory at Antietam resulted in President Abraham Lincoln issuing his Preliminary Emancipation Proclamation on September 22, 1862.