“Khalji’s military exploits in the east also resulted in conversions to Islam. About the end of the twelfth or the beginning of the thirteenth century, he marched into Bihar and attacked the University centres of Nalanda, Vikramshila and Uddandapur, erecting a fortress at the site of Uddandapur or Odantapuri. The Buddhist monks in these places were massacred and the common people, deprived of their priests and teachers, turned some to Brahmanism and some to Islam. Buddhism did not die out immediately or completely in Bihar. But Bakhtiyar’s raid on Bihar did deliver a shattering blow to Buddhism and its lost followers were gained mainly by Islam.”
Lal, K. S. (2012). Indian muslims: Who are they.
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Muhammad bin Bakhtiyar Khalji 4
Turkic military general of Qutb al-Din AibakRelated quotes

"The Decline and Fall of Buddhism", in Dr. Babasaheb Ambedkar: Writings and Speeches, Vol. III (1987), Government of Maharashtra, p. 238

"The Decline and Fall of Buddhism", in Dr. Babasaheb Ambedkar: Writings and Speeches, Vol. III (1987), Government of Maharashtra, p. 229-388
Muntakhab-ut-Tawarikh, quoted from Goel, Sita Ram (2001). The story of Islamic imperialism in India. ISBN 9788185990231 Ch. 6
Muntakhab-ut-Tawarikh
Louis Frederic, L'Inde de l'Islam, p. 42-49, (quoted from: Decolonizing the Hindu Mind - By Koenraad Elst p. 328)

Dr. Murray Titus quoted from B.R. Ambedkar, Pakistan or The Partition of India (1946) (Alternative translation: “those of the garrison who were wise and acute were converted to Islam, but those who stood by their ancient faith were slain with the sword”. Lal, K. S. (1990). Indian muslims: Who are they. Original quote is from Hasan Nizami, Taj-ul-Maasir, E.D. https://archive.org/stream/cu31924073036729#page/n237/mode/2up/)

Palamau (Bihar), Koch Bihar (Bengal). Alamgirnamah of Mirza Muhammad Kazim , cited in : Sharma, Sri Ram, Religious Policy of the Mughal Emperors, Bombay, 1962. p. 129.
Quotes from late medieval histories, 1660s

Your Thought and Mine
Context: Your thought advocates Judaism, Brahmanism, Buddhism, Christianity, and Islam. In my thought there is only one universal religion, whose varied paths are but the fingers of the loving hand of the Supreme Being. In your thought there are the rich, the poor, and the beggared. My thought holds that there are no riches but life; that we are all beggars, and no benefactor exists save life herself.

Source: The Clash of Civilizations and the Remaking of World Order (1996), Ch. 12 : The West, Civilizations, and Civilization, § 2 : The Commonalities Of Civilization, p. 320
Context: At least at a basic “thin” morality level, some commonalities exist between Asia and the West. In addition, as many have pointed out, whatever the degree to which they divided humankind, the world’s major religions — Western Christianity, Orthodoxy, Hinduism, Buddhism, Islam, Confucianism, Taoism, Judaism — also share key values in common. If humans are ever to develop a universal civilization, it will emerge gradually through the exploration and expansion of these commonalities. Thus, in addition to the abstention rule and the joint mediation rule, the third rule for peace in a multicivilizational world is the commonalities rule: peoples in all civilizations should search for and attempt to expand the values, institutions, and practices they have in common with peoples of other civilizations.
This effort would contribute not only to limiting the clash of civilizations but also to strengthening Civilization in the singular (hereafter capitalized for clarity). The singular Civilization presumably refers to a complex mix of higher levels of morality, religion, learning, art, philosophy, technology, material well-being, and probably other things. These obviously do not necessarily vary together. Yet scholars easily identify highpoints and lowpoints in the level of Civilization in the histories of civilizations. … When civilizations first emerge, their people are usually vigorous, dynamic, brutal, mobile, and expansionist. They are relatively uncivilized. As the civilization evolves it becomes more settled and develops the techniques and skills that make it more Civilized. As the competition among its constituent elements tapers off and a universal state emerges, the civilization reaches its highest level of Civilization, its “golden age,” with a flowering of morality, art, literature, philosophy, technology, and martial, economic, and political competence. As it goes into decay as a civilization, its level of Civilization also declines until it disappears under the onslaught of a different surging civilization with a lower level of Civilization.