Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.53, Skyhorse Publishing, Inc.
Quoted in Battles and Leaders of the Civil War (1887 - 1888). This line is popularly said to have been Sedgwick's last words and to have been cut off in the middle of "distance." In fact, this was Sedgwick's second-to-last sentence and was completed before the bullet hit.
Gen. John Joseph Pershing to Gen. Foch, Letter written from Office of the Commander-in-Chief, American Expeditionary Forces, in France. "Literary Digest History of World War," Volume V, p. 43, March 28, 1918.