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That very day - July 4, 1863 - Ulysses S. Grant was promoted to Major General and he would soon replace Halleck as the Union General-in-Chief. It would be Grant's relentless pursuit of Lee and his Army of Northern Virginia, pressing the North's vastly superior resources against his undermanned foes, that would bring the war to an end. The Battle of Gettysburg insured that the Confederacy would not win the Civil War; the Siege of Vicksburg insured the Confederacy would lose the war.