In the North, Lincoln told Major General Joseph Hooker to have the Union army follow Lee's army. But Hooker was very reluctant to go after the Confederates. Finally, Lincoln lost all confidence in him. On June 28, three days before the Battle of Gettysburg, Lincoln appointed General Meade to replace Hooker. Had the Confederacy won, confederate force would have had access to Philadelphia or Baltimore. Vice President Hannibal Hamlin went to Lincoln to discuss a prisoner of war trade five days before the Battle of Gettysburg.