One of the cardinal features that kept the Sanatana civilization unbroken for centuries was a sense of permanence of dwelling. The original Sanatana village was not only smallest unit of administration since time immemorial, it was also self-contained in almost all matter. It was rare for a villager to step out of his village except for say, attending functions, festivals, and going on a Yatra. But this was rudely, cruelly disrupted forever thanks to waves upon waves of Muslim invasions and raids spread over several centuries. It is estimated that throughout Northern and Eastern India, there is only one village near Hissar in Haryana, which can trace its antiquity to a paltry 600 years. There. Here is one more topic for a Phd thesis: the forced migrations of millions of Hindus from their original homes to various parts of India. This is a historical study of more than a thousand years. The interested student will find such a study highly rewarding.