He was McClellan.
He was in command from November 1861 to October 1862.
The Army of Virginia.
Burnside led the Union troops.
Meade took over command from Hooker on the way to the battlefield.
Ulysses Grant
Shiloh
Grant
No he was in command of the Army of Northern Virginia.
Robert E. Lee
Major General George G. Mead was in command of the Union Army of the Potomac at Gettysburg.
The Union field army involved was the Army of the Potomac, at that time under the command of Major General Joseph Hooker. Under "related links" below is a link to a Union "Order of Battle" for the Army of the Potomac at Chancellorsville which lists all units in a particular command at a certain moment in time.
Two corps of the Union Army were called Cavalry Corps during the American Civil War. Gen. Joseph Hooker took command of the Army of the Potomac.
William T. Sherman