After the liberation of the Mississippi, Grant was ordered East, to rescue the Army of the Cumberland from starvation at Chattanooga.
After McDowell's failure at the First Battle of Bull Run, George McClellan was ordered to lead he Union army in the east. This was order was given by Lincoln.
Henry Wirz
General George Meade ; "Old Snapping Turtle" .
There were at times several Union armies operating in the Eastern Theater of the US Civil War. The main one was the Army of the Potomac. Other Union armies in the east were the Army of the James, and the Army of Virginia.
The Army of the Potomac.
Army of the Potomac
Army of the Potomac
George McClellan
George McClellan
George McClellan
The main goal of the Union army in the east was to not be defeated by the Confederacy. This was the main goal of the entire Union Army from 1861 to 1864.
Meade commanded the Army of the Potomac.