Generals in Chief of the Union Army

Winfield Scott	July 5, 1841 – November 1, 1861
George B. McClellan	November 1, 1861 – March 11, 1862
Henry W. Halleck	July 23, 1862 – March 9, 1864
Ulysses S. Grant	Mrch 9, 1864 – March 4, 1869