Ulugh Khan Balban attacked Karra in 1248; there, records Siraj, his ‘taking of captives and his capture of the dependents of the great Ranas (Hindu p… - Minhaj-i-Siraj

It is related that this Muhammad Bakhtiyar was a Khil-ji, of Ghor, of the province of Garmsir. He was a very smart, enterprising, bold, courageous, wise and experienced man. .... Being a bold and enterprising man he used to make incursions into the districts of Muni (Monghir), and Behar, and bring away much plunder until in this manner he obtained plenty of horses, arms, and men. The fame of his bravery and of his plundering raids spread abroad, and a body of Khiljis joined him from Hindustan. His exploits were reported to Sultan Kutbu-d din, and he sent him a dress and showed him great honour. Being thus encouraged, he led his army to Behar and ravaged it. In this manner he continued for a year or two to plunder the neighbourhood, and at last prepared to invade the country.... Muhammad Bakhtiyar with great vigour and audacity rushed in at the gate of the fort and gained possession of the place. Great plunder fell into the hands of the victors. Most of the inhabitants of the place were Brahmans with shaven heads. They were put to death. Large numbers of books were found there, and when the Muhammadans saw them they called for some persons [p. 55] to explain their contents, but all the men had been killed. It was discovered that the whole fort and city was a place of study (madrasa). In the Hindi language the word Behar (vihar) means a college.

That heart which, through separation, thou madest sad;
From every joy that was, which thou madest bare of;
From thy disposition I am aware that, suddenly and unexpectedly,
The rumour may arise that thou hast broken it.

Let us return to the thread of our history. The last event which I have to record is this. When Ulugh Khan carried war into the hills, and punished the rebels in the way we have related, a number of them escaped by flight. They now again took to plundering on the highways, and murdering Musulmans, so that the roads became dangerous. This being reported to the Khan, he sent emissaries and spies to find out the places where the rebels had taken refuge, and to make a full report of their state and condition. On Monday, 24th Rajab, 658 (July, 1260), he marched from Delhi with his own forces, the main army, and the forces of several chiefs. He hastened towards the hills, and accomplishing more than fifty kos in one day’s journey (!) he fell upon the insurgents unawares and captured them all, to the number of twelve thousand –men, women, and children– whom he put to the sword. All their valleys and strongholds were overrun and cleared, and great booty captured. Thanks be to God for this victory of Islam!