Battle of Antietam
Do you actually know what happened???
The Battle of Antietam
Even though there had been many deaths during the battle, it ultimately ended in a draw/tie, but Abraham Lincoln saw it as a victory since the Confederates retreated. This was a "victory" he needed to pass the Emancipation Proclamation, which states that all slaves held within rebellious states "are, and henceforward shall be free." Over the course of the battle, there were many vicious attacks and counterattacks crossing Miller's cornfield. The Union assautled the Sunken Road, but there were no other advances by the Union army, so they we just there. They were skirmishing again on the 18th while removing his wounded soldiers to Potamac.(source 2, civilwar.org)
You can see here that it was located in the northwestern region, and see how far everyone traveled.
Look at That
This was only a fraction of the size of the full Battle of Antietam. Imagine how large this battle actually was.
There are many more people that died in this battle, this was only one section of the battle, one trench that was nearly completely wiped out.