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 bloodiest battle of the war (Gettysburg) and the bloodiest single day of the war (Antietam) were both fought in this theater. The capitals of Washington, D.C. , and Richmond were both attacked or besieged.