What was the outcome battle in 1862?

The outcome of the Battle of Antietam, fought on September 17, 1862, was a tactical draw but a strategic victory for the Union. It marked the bloodiest single-day battle in American history, with about 22,000 casualties. The battle halted the Confederate invasion of the North led by General Robert E. Lee and allowed President Abraham Lincoln to issue the Emancipation Proclamation shortly thereafter, which changed the focus of the war to include the abolition of slavery.