It's probably not accurate to say more than one million people were killed during partition, but some 10 or 20 million people were forcibly moved from their homes, long distances. That's a lot of lamentable suffering, even if it's short of genocide.
Post-partition Hindu-Muslim violence, and other kinds of sectarian violence, probably do not approach one million dead.
A reminder for everyone: on this day in 1983, Stanislav Petrov saved the world.
It occurs to me this time around that there's an interesting relationship here - 9/26 is forgotten, while 9/11 is remembered. Do something charitable, and not patriotic, sometime today.