One hundred fifty years ago Monday, on September 17, 1862, the Union army commanded by Major General George McClellan met a Confederate force under Robert E. Lee at Antietam Creek in western Maryland, outside the town of Sharpsburg.
For 12 hours, 87,000 Union soldiers launched a series of attacks against 45,000 Confederates. The result was a staggering loss of human life. When dark approached and the fighting ended, almost 25,000 were dead, wounded, or missing. Neither before nor since have more Americans been killed in a single day.