What Resulted in the Single Bloodiest Day in American History at the Battle of Antietam?

The Battle of Antietam was a turning point in the American Civil War. On September 17, 1862, Union and Confederate forces clashed in what would become the single bloodiest day in American history. In this article, we will explore the events that led to this tragic day.

The Prelude to the Battle

After a series of Confederate victories, General Robert E. Lee decided to invade Maryland in hopes of gaining support from anti-war Democrats and obtaining much-needed supplies. His army of approximately 40,000 men crossed into Maryland on September 4th.

Meanwhile, Union General George McClellan had been tasked with defending Washington D.C., but he decided to pursue Lee’s army into Maryland. He gathered an army of about 75,000 men and pursued Lee.

On September 13th, Union soldiers discovered a copy of Lee’s battle plans wrapped around three cigars. The plans revealed that Lee had divided his forces into three separate parts and spread them out across the area.

The Battle Begins

On September 17th, the two armies clashed near Antietam Creek. The battle began at dawn when Union General Joseph Hooker’s troops attacked Confederate General Stonewall Jackson’s men. The battle raged on for hours with both sides suffering heavy losses.

By mid-afternoon, Union General Ambrose Burnside succeeded in crossing a bridge over Antietam Creek and attacked Confederate positions on the opposite side. The Confederates tried to hold their ground but were eventually overwhelmed by Burnside’s troops.

The Aftermath

The Battle of Antietam resulted in over 22,000 casualties – more than any other single day in American history. The Confederates suffered approximately 12,000 casualties while the Union lost around 10,000 men.

Despite their losses, Lee was able to withdraw his army back into Virginia. The Union victory at Antietam gave President Abraham Lincoln the opportunity to issue the Emancipation Proclamation, which declared that all slaves in Confederate territory would be freed.


The Battle of Antietam was a crucial turning point in the American Civil War. It resulted in heavy casualties on both sides and paved the way for the Emancipation Proclamation.

By incorporating various HTML elements such as for bold text, for underlined text,


  • for lists, and


    , etc. for subheaders, we hope to have made this article both informative and engaging.