Firishta's History (Gulshan-i Ibrāhīmī) 58.3.5

58.3.5

Mahmood Shah Poorby of Bengal shut himself up in Goor, to which Sheer Khan laid siege; but learning that the zemindars of Behar, during his absence, had raised an insurrection, he left Khowas Khan to prosecute the siege of Goor, and returned in person to Behar. Shortly afterwards Sheer Khan rejoined the army, and the garrison of Goor being straitened for supplies, Mahmood Shah fled in a boat to Hajypoor. Being closely pursued by Sheer Khan, he gave battle, but was defeated and wounded in the action; and abandoning his kingdom, it fell into the hands of Sheer Khan. Hoomayoon, returning from Guzerat, conceived it necessary to check Sheer Khan's rising power; for which purpose, he marched towards Chunar. Julal Khan, a son of Sheer Khan, who commanded there, left the defence to Ghazy Khan Soor, and retired to the hills of J'harcund, from whence he returned and annoyed the besiegers. The siege was carried on for six months, when Roomy Khan, who commanded Hoomayoon's artillery, reduced the fort by means of floating stages which have been already described.