What is the narionality of the author of the biography Halleck: Lincoln's Chief of Staff ?
Halleck: Lincoln's Chief of Staff: Halleck: Lincoln's Chief of Staff is the biography of Union Army General-in-Chief Henry Halleck written by Stephen E. Ambrose and published in 1962. Stephen E. Ambrose: Stephen Edward Ambrose (January 10, 1936 – October 13, 2002) was an American historian and biographer of U.S. Presidents Dwight D. Eisenhower and Richard Nixon.
American