Why did Robert E Lee lead the Confederate Army into Maryland in the Battle of Antietam?

Robert E. Lee led the Confederate Army into Maryland during the Battle of Antietam in September 1862 to achieve several strategic goals. He aimed to relieve pressure on Virginia, gather supplies, and potentially sway the border state of Maryland to join the Confederacy. Additionally, a Confederate victory on Union soil could boost Southern morale and influence European powers to recognize the Confederacy. Ultimately, Lee sought to shift the war's momentum in favor of the South.