After the death of Iltutmish, there was a brief lull in enslavement because of the weakened power of the sultans. In 1244, Sultan Nasiruddin Mahmud, … - Mohammed Qacim Ferichta

…He was firmly attached to the Mahomedan religion, and made a point of destroying all Hindoo temples. In the city of Mutra he caused musjids and bazars to be built opposite the bathing-stairs leading to the river and ordered that no Hindoos should be allowed to bathe there. He forbade the barbers to shave the beards and beads of the inhabitants, in order to prevent the Hindoos following their usual practices at such pilgrimages…

“This answer was communicated to the Raja of Dehli, who, resolving to oppose the invaders, sent messengers throughout Hindustan to acquaint the other Rajas that Mahmud, without provocation, was marching with a vast army to destroy Thanesar, now under his immediate protection. He observed that if a barrier was not expeditiously raised against this roaring torrent, the country Hindustan would be soon overhelmed, and every state, small and great, would be entirely subverted. It, therefore, behoved them to unite their forces at Thanesar, to avert the impending calamity.

The king, in his zeal to propagate the faith, now marched against the Hindoos of Nagrakote [Nagarkot Kangra], breaking down their idols and razing their temples. The fort, at that time denominated the Fort of Bheem, was closely invested by the Mahomedans, who had first laid waste the country around it with fire and sword.'...