Due to his loss to the Confederate at the Battle of Antietam, President Lincoln Removed his leadership

Answer 1

and appointed General Ulysses S. Grant as the new commander of the Union army. Grant would go on to lead the Union to victory in the Civil War, eventually leading to the surrender of the Confederacy and the end of the war. Lincoln's decision to remove his leadership was a pivotal moment in the war and ultimately led to the Union's success.