Writing of Gettysburg, which is herein so graphically depicted by Haskell, General Francis A. Walker, in his History of the Second Army Corps, refers to our author as one who was "bravest of the brave, riding mounted through an interval between the Union battalions, and calling upon the troops to go forward." He further says: "Colonel Frank A. Haskell, of Wisconsin, had been known for his intelligence and courage, for his generosity of character and his exquisite culture, long before the third day of Gettysburg, when, acting as aide to General Gibbon, he rode mounted between the two lines, then swaying backward and forward under each other's fire, calling upon the men of the Second Division to follow him, and setting an example of valor and self devotion never forgotten by any man of the thousands who witnessed it."