Butler didn't wear boots, he wore slippers most of the time.
Edit - Sorry, Foosfoos, but I can't find any source supporting your contention that Butler wore slippers instead of boots. Even if I could, it's questionable whether "slippers" could be considered the same thing as "shoes."
Welcome to the trivia game, anyway. Hope you'll come back and play again.
William Tecumseh Sherman. Uncle Billy, as the men called him, didn't like the feel of boots when he was riding his horse Sam, named after Grant. He said it was to hard to think with boots on.