What made the battle of antietam the single bloodiest day in american history? a) union troops outnumbering confederate troops 2 to 1 b) confederate troops unexpectedly using guerilla tactics c) marching troops forward in close order against newer, more accurate weapon d) amassing the largest armies ever in one place

The correct option is A

The battle of Antietam (also known in the southern historiography as the battle of Sharpsburg) was the first major armed confrontation of the American civil war that took place in northern territory. The battle took place on September 17, 1862, near Sharpsburg, in Washington County, Maryland, United States, and in the vicinity of the Antietam stream. The battle was part of the Maryland Campaign and is the bloodiest in the history of the United States that was fought in a single day, with almost 23,000 casualties