The Muslim conquest of the Indian subcontinent led to widespread carnage because Muslims regarded the Hindus as infidels and therefore slaughtered and converted millions of Hindus. Will Durant argued in his 1935 book The Story of Civilization: Our Oriental Heritage (page 459):
There is no official estimate of the total death toll of Hindus at the hands of Muslims.
As Braudel put it:"The levies it had to pay were so crushing that one catastrophic harvest was enough to unleash famines and epidemics capable of killing a million people at a time. Appalling poverty was the constant counterpart of the conquerors' opulence."
The backward castes of Hinduism suffered worst. Monarchs (belonging to backward castes) such as Khusrau Bhangi Khan, Hemchandra and Garha-Katanga were knocked off their throne and executed. Backward caste saints like NamadevaP. 88 The Rosary and the Lamp By Baburao Patel were arrested, while women like Kanhopatra were forced to commit suicide. Ghisadis have an “Urdu” title.The Castes and Tribes of H.E.H. the Nizam's Dominions