 Complete the following phrase:  The Eastern Theater was the venue for several major campaigns launched by the Union Army of the Potomac to capture the Confederate capital of Richmond, Virginia; many of these were frustrated by the Confederate Army of Northern Virginia, commanded by General Robert E. Lee. President Abraham Lincoln sought a general to match Lees boldness, appointing in turn Maj. Gens. Irvin McDowell, George B. McClellan, John Pope, Ambrose Burnside, Joseph Hooker, and George G. Meade to command his principal Eastern armies. While Meade gained a decisive victory over Lee at the Battle of Gettysburg in July 1863, it was not until newly appointed general-in-chief Ulysses S. Grant arrived from the Western Theater in 1864 to take personal control of operations in Virginia that Union forces were able to capture Richmond, but only after several bloody battles of the Overland Campaign and a nine-month 