Firishta's History (Gulshan-i Ibrāhīmī) 57.3.7

57.3.7

The three royal brothers having met at Agra, held daily consultations; but Kamran, averse to composing their differences, abandoned their councils, and proposed to return to Lahore, to which measure he was principally instigated by Khwaja Kullan Beg. Hoomayoon in vain used every argument to prevent his departure; but the ambition of Kamran prompted him to independence. and he accordingly withdrew from his brothers' councils. These dissensions had continued six months, when Kamran was suddenly seized with dysentery, owing to too great indulgence of his appetite; and imputing the disease to poison, he quitted the court for Lahore, leaving a thousand horse only under Sikundur Sooltan, one of his officers. Hoomayoon's soldiers, greatly disconcerted by the departure of Kamran Mirza, deserted, and many of them accompanied him. Among others, however, Mirza Hydur Doghlat, disgusted with his conduct, abandoned his standard, and joined Hoomayoon, to whom he was afterwards of great service. Sheer Khan, who had remained quiet during these disputes, now advanced with an army to the banks of the Ganges, and detaching his son Kootub Khan across the river, took possession of the adjacent provinces. Hoomayoon, on receiving intelligence of his movements, ordered Kasim Hoossein Sooltan, in conjunction with Yadgar Nasir Mirza and Sikundur Sooltan, to oppose him. They met the enemy at Kalpy, where an obstinate engagement took place, in which victory declared in favour of the Moguls.