what is the bloodiest battle of the us civil war?
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 1st Texas Infantry lost 82 percent of its menduring the Battle of Antietam, the highest casualty rate for any Confederate regiment in one battle of the Civil War.