How did lees plan in Maryland work?

Lee's plan in Maryland, specifically during the Antietam campaign in 1862, aimed to take the war into the North and gain a decisive victory that could sway public opinion in favor of the Confederacy. General Robert E. Lee sought to capitalize on perceived weaknesses in Union defenses while also potentially rallying support among Southern sympathizers in the border states. However, the plan faltered due to logistical challenges and the discovery of his battle orders by Union forces, leading to the costly Battle of Antietam, which ended in a tactical stalemate but provided President Lincoln the opportunity to issue the Emancipation Proclamation.