This chapter chronicles the philosophical development of the abrasive, brilliant Elizabeth Anscombe and her contribution to her friends’ implicit project of reshaping mid-century ethics: her all-out attack against “Oxford Moral Philosophy” epitomized by R.M. Hare, and her publication of the influential “Modern Moral Philosophy.” Anscombe was Wittgenstein’s apprentice and translator for much of her early career, rarely publishing original work. She was, nonetheless, a fearsome adversary of anyone she saw as glib or insufficiently serious, including C.S. Lewis and J.L. Austin. Anscombe’s real engagement with ethics began with her attempt to stop Oxford from bestowing an honorary degree on Harry Truman; she abhorred his decision to bomb Hiroshima and Nagasaki. She was invited to give a radio broadcast, “Oxford Moral Philosophy: Does It Corrupt the Youth?”—the opening salvo in a fight with R.M. Hare, which resulted in her influential essay “Modern Moral Philosophy.”