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.
It was one of the bloodiest battles of the American Civil War and remains the single bloodiest day in American history with over 23,000 casualties. President Abraham Lincoln used the Union victory at Antietam to make his Preliminary Emancipation Proclamation on September 22, 1862.