Which battle marked the deadliest day of the American Civil War?
The battle that marked the single deadliest day of the American Civil War was the Battle of Antietam, also known as the Battle of Sharpsburg. Fought on September 17, 1862, near Sharpsburg, Maryland, the battle resulted in a staggering 22,717 total casualties (killed, wounded, and missing) from both the Union and Confederate armies combined, all occurring within just twelve hours of intense fighting.
This horrific casualty count makes the Battle of Antietam the bloodiest one-day battle in American history. While later engagements like the Battle of Gettysburg had higher total casualty counts over multiple days, no other single day of the Civil War—or any American war—saw as many Americans killed and wounded as the vicious fighting that occurred along Antietam Creek.
Source:
https://www.youtube.com/watch?v=isVPdIBg6Fk
https://www.threads.com/@beliproduk.official/post/DRZv0lXEijr