The Mussalman invaders sacked the Buddhist universities of Nalanda, Vikramshila, Jagaddala, Odantapuri to name only a few. They razed to the ground B… - Muhammad bin Bakhtiyar Khalji

In the vicinity of this place was perceived a temple, very lofty and strong, and of beautiful structure. In it there were numerous idols of gold and silver, and one very large golden idol, which exceeded two or three thousand miskals in weight. Muhammad Bakhtiyar and the remnant of his army sought refuge in that temple, and set about procuring wood and ropes for constructing rafts to cross the stream. The Rai of Kamrup was informed of the distress and weakness of the Muhammadans, and he issued orders to all the Hindus of his territory to come up, levy after levy, and all around the temple they were to stick their bamboo spears in the ground and to plait them together so as to form a kind of wall. Then the soldiers of Islam saw this they told Muhammad Bakhtiyar that if they remained passive they would all be taken in the trap of the infidels and be made prisoners; some way of escape must be sought out. By common consent they made a simultaneous sally, and directing their efforts to one spot, they cleared for themselves a way through the dangerous obstacle to the open ground. The Hindus pursued them to the banks of the river and halted there. Every one exerted his ingenuity to devise some means of passing over the river. One of the soldiers urged his horse into the water, and it was found fordable to the distance of a bow-shot. A cry arose in the army that a fordable passage was found, and all threw themselves into the stream. The Hindus in their rear took possession of the banks. When the Muhammadans reached the middle of the stream, the water was found to be very deep, and they nearly all perished. Muhammad Bakhtiyar with some horse, to the number of about a hundred, more or less, crossed the river with the greatest difficulty, but all the rest were drowned….

When, after descending the hill of the land of Kamrup, they reached the bridge, they found that the arches of it had been demolished. The two officers who had been left to guard it had quarreled, and in their animosity to each other had neglected to take care of the bridge and the road, so the Hindus of Kamrup had come there and destroyed the bridge. When Muhammad Bakhtiyar with his army reached the place, he found no means of crossing. Neither was there a boat to be found, so he was greatly troubled and perplexed. They resolved to fix on some place where to encamp, and prepare rafts and boats to enable them to cross the river.

Muhammad Bakhtiyar sweeping the town with the broom of devastation, completely demolished it, and making anew the city of Lakhnauti… his metropolis, ruled over Bengal… and strove to put in practice the ordinances of the Muhammadan religion… and for a period ruling over Bengal he engaged in demolishing the temples and building mosques.