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 Civil War was the bloodiest conflict in United States history; by the end, some 620,000 Americans lay slain on domestic battlefields. The two-day Battle of Shiloh on the banks of the Tennessee River saw more American casualties than all previous wars combined.