[2] In 1228, Raja Prithu of Kamarupa was killed by Malik-us-said Nasir-ud-din Mahmud Shah and his son was placed on the throne on the condition of paying tributes.

In 1229, Nasir-ud-din, the governer of Bengal died, Raja Sandhya of Kamata Kingdom drove away Muslims from the country and brought the regions up to Karatoya under his control.

Next, Raja Sandhya invaded Gaur and with the support of several Hindu chiefs of Kamarupa called Bhuyans, annexed trans–Karatoya regions without any strong resistance from the Muslims.

The sultan caught hold of a guide who undertook to conduct his army by a shorter route through the submontane tract, evidently by way of Cooch Behar and Jalpaiguri, in the direction of Devkot.

[7] In an engagement there, the entire Turkish army was defeated and killed and the sultan with all his children, family and dependents became captives in the hands of Sandhya.