i believe that a soldier had gotten extremely lucky and had found the south's war plans and passed them on to his commanding officer/general.
The Battle Happened because the Southerners were going to attack the Northern capital Washington, D.C.
McClellan had several advantages going into the Battle of Antietam, notably his numerical superiority with approximately 87,164 Union troops compared to Robert E. Lee's 38,000 Confederate soldiers. Additionally, McClellan received a copy of Lee's battle plans, which provided crucial insights into the Confederate strategy. This intelligence allowed him to prepare more effectively for the engagement, contributing to the Union's tactical advantages during the battle.
During the Apocolypse
The Union won The Battle of Antietam. Jefferson Davis wanted to win that battle to gain the aid of Britain and France but they lost so he didn't get their help. the battle of Antietam is said to be the turning point of the US Civil War. it was the time when people knew that the Union was going to win this war.The Battle of Antietam, aka Sharpsburg, was actually a tactical draw. Although the Confederates withdrew after the battle, they mauled the Union forces there, who heavily outnumbered them.And, the battle was hardly a turning point, as Lee's army won many victories after, including Fredricksburg and Chancellorsville. The issue was in doubt for much, much longer than Antietam.
George Washington's plan of attack for the Battle of Trenton was to engulf Rall's forces. He was going to do it with two columns of 2,4000 men.
The turning point of this battle was when we broke the IJN code and knew they were going to attack Midway
calais
The Battle of Antietam made the British realize that the Confederacy could not win the war. The Union had too much man power and they were industrialized, so they had a huge advantage in the supply arena. Britain knew that the Confederacy could not become a stable, sovereign nation. They were going to be too dependent on the north for industry whether they won the war or not.
If I recall the three were in a Trench or Trench Warefare, In a corn field, and on a bridge but that was a diversion cause they were going around.
George Washington thought the British were going to attack Long Island because this was the easiest port for the troops to reach. When the Battle of Long Island did take place Washington and his troops were defeated.
The American Civil War (1861-1865)
General Ambrose Burnside was the commander of Union's IX Corps. About noon he attacked the Confederate right flank and managed to drive back Longstreet's Confederate units to the southern end of Sharpsburg. The battle was decisively going in favor of Union Army. But Confederate division under General Ambrose P. Hill, coming from Harper's Ferry stroke the Federals in the flank driving back them to Antietam Creek, saving Lee's army and ended the battle.