Western Theater of the American Civil War heart of the Confederacy. Bragg, whose personal friendship with Confederate President Jefferson Davis saved his command following his defeats at Perryville and Stones River, was finally relieved of duty and replaced by General Joseph E. Johnston. In March 1864, Grant was promoted to lieutenant general and went east to assume command of all the Union armies. Sherman succeeded him in command of the Military Division of the Mississippi. Grant devised a strategy for simultaneous advances across the Confederacy. It was intended to destroy or fix Robert E. Lee's army in Virginia with three major thrusts (under Meade, Butler, and Sigel)
Army of Northern Virginia Burnside's Bridge proved to be too much for Lee and his Confederate army. Luckily for Lee, the arrival of A.P. Hill's troops and the mixture of McClellan's and Burnside's sluggishness, saved Lee's Army of Northern Virginia and allowed them to barely hold off the Union in Maryland. Although the Army of Northern Virginia swelled and shrank over time, its units of organization consisted primarily of corps, earlier referred to as "wings" or "commands": The Army fought in a number of campaigns and battles, including: On April 9, 1865, the Army of Northern Virginia surrendered to the Army of the Potomac