Partition violence killed half a million to a million people and displaced twelve million.

Evidence

Gandhi, the Apostle of Peace and Non-violence, lived to see the movement he thought he led dissolve into a paroxysm of genocidal violence in which half a million people (a million, according to Stanley Wolpert in A New History of India) lost their lives and almost twelve million lost their homes, their past and everything they had ever known. — Ambedkar, B R, Annihilation of Caste_ The Annotated…, 171