In the Assam campaign “khani-khanan ordered that the prisoners should have the heads of the slain tied round them, and be thus exposed to the derisio… - K. S. Lal

Alauddin had 50,000 slaves some of whom worn mere boys,* and surely many captured during wax. Firoz Tughlaq had issued an order that whichever places were sacked, in them the-captives should be sorted out and the best ones tht for service with the Sultan) should be forwarded to the court/ 0 Soon he was enabled to collect ISO.OOO slaves.’ Ziyauddin Barani's description of the Slave Market in Delhi (such markets were there isi other places also) during the reign of Alauddin Khaljt, shows (hat ficsh batches of slaves were constantly replenishing them.

Throughout the Muslim rule destruction of Hindu shrines and construction of mosques and other building from their materials and at their very sites went on as a normal practice. From the Quwwal-ul-Islam mosque in Delhi built out of twenty-seven Hindu and Jain temples in the twelfth century to the Taj-ul-Masajid built from hundreds of Hindu and Jain temples at Bhopal in the eighteenth century, the story is the same everywhere.

The source is the late Delhi Univ history professor K.S. Lal. But his claim is not that 80 millions were physically killed by the invaders/occupiers, merely that 80 million have gone missing from the extrapolated demographic development (itself already a very risky guess) during that period. This includes people killed, but also the effect of lawlessness and famines which he claims were triggered by the extremely high taxation and other deliberate poverty-promoting policies of the Delhi Sultanate.