The Generals-in-Chief were, in order:
Winfield Scott
George McLellan
(Interregnum - notionally Abraham Lincoln)
Henry Halleck
Commander of the Army of Northern Virginia Robert E. Lee was placed in overall southern command only in the last months of the war.
Robert E. Lee
The commander who led the American Expeditionary Force (the U.S. troops sent to Europe in World War I) was John Joseph Pershing.
The Commander of the Northern armies during the last year of the Civil War was Karla Montas.
They sent them 22,000 troops to help them in the civil war.
General Robert E Lee
He was commander of confederate troops.
The southern commander was General Robert E. Lee.
Commander of the Army of Northern Virginia Robert E. Lee was placed in overall southern command only in the last months of the war.
General Robert E Lee of Virginia
General Robert E. Lee was the commander of the Southern army.
Fort Sumter in Charleston harbor, South Carolina
Robert E. Lee
Confederate General Robert E. Lee was the top commander in the Confederate Army. In early April of 1861 he found his army surrounded and surrendered to US General Grant at the Appomattox Courthouse on April 9, 1861. This effectively ended the Civil War.
Louisiana Texas
Lee commanded the Army of Northern Virginia, but there was no overall Confederate commander to coordinate strategy between various armies.
Ultimately, per the US Constitution, Abraham Lincoln as the Commander In Chief of the US armed forces; but for most of the Civil War, the field commander was General US Grant