What were the causes and effects of the Battle of Antietam?

Quick Answer. The Battle of Antietam during the American Civil War was caused by General Robert E. Lee's desire to follow up his victory at the second Battle of Manassas by heading north into Maryland. His intentions were to sever rail links to Washington and seize supplies. read more

The Battle of Antietam, also known as the Battle of Sharpsburg, resulted in Confederate forces under General retreating from the state of Maryland during his first invasion of Union territory. Although losses on both sides were so great that they marked the single bloodiest day in United States history, Lee's forced retreat from Maryland was considered a Union victory and a turning point in the war. read more