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the battle of Antietam cost more lives than any other battle in the War between the States.
Not the worst, but one of the worst.
The answer to this question depends on how worst is defined. If worst is based on number of Union casualties and long term impact, it would be the Battle of Chancellorsville, which took place in Virginia between May 1 and May 4, 1863. The Union's casualties at the Battle of Chancellorsville exceeded those of the Confederacy by more than 4,000, 17,278 to 12,821. Union casualties during the four-day battle were the most of all other battles of the Civil War with the exception of Gettysburg and Spotsylvania. It was second only to the Seven Days battle for the most combatants of all Civil War battles with 195,000 total combatants. Considered General Robert E. Lee's greatest victory of the war, the Battle of Chancellorsville was a decisive victory for the Confederacy and a bitter and unexpected failure for the Union army resulting in the removal of General Joe Hooker of command of the Union Army by President Lincoln.
There were about 700 casualties on both sides at Appomattox. This was far less than a major battle.
It is called "Death Day" because it was one of the worst battles in world war 2, it had more casualties then any other battle.