Pleased you like it, Laurie and Roger, and the story continued quite funny, too. Lincoln later said to the same man:
"General..., when the war begun, I thought a cavalryman should be at least six feet four inches high, but I have changed my mind. Five feet four will do in a pinch."
Tom, I'm sorry, I overlooked your reply. Brilliant, you were perfectly right! It was Philip Sheridan (see his Civil War Memoirs).