Political map of North America & the Caribbean 21 December 1864 (Sherman's March to the Sea): In 1864, the Union armies were placed under the command of Ulysses S. Grant, hero of Vicksburg (Battle of Vicksburg). Grant attacked the Confederates in Virginia (Overland Campaign), wearing down Lee (Robert E. Lee) in a slow but steady advance on Richmond (Richmond, Virginia), while General William Tecumseh Sherman marched through Georgia to the sea (Sherman's March to the Sea), cutting the eastern Confederacy in two.