Firishta's History (Gulshan-i Ibrāhīmī) 27.7

27.7

He caused the Bengal currency to be struck in his own name, and, appointing his son Nasir-ood-Deen Mahmood to the government of Behar, returned to Dehly. But soon after war having broken out between Nasir-ood-Deen Mahmood, Prince of Behar, and Gheias-ood-Deen Bukhtyar, Khiljy of Bengal, the latter was defeated and slain; and Nasir-ood-Deen took possession of his principality and his treasure, out of which he sent ample presents to his friends at Dehly. According to the most authentic historians it was in this year (622) that Shums-ood-Deen Altmish marched against Nasir-ood-Deen Koobacha, who possessed the provinces on the Indus, and who, unable to oppose him in the field, left a strong garrison in Oocha, and retired to Bukkur. Altmish detached Nizam-ool-Moolk Jooneidy, his vizier, with half of the army, in pursuit of Nazir-ood-Deen Koobacha, while with the other half he himself laid siege to Oocha, which he reduced in two months and twenty days. When the news of the fall of Oocha reached Nasir-ood-Deen Koobacha, he sent his son Alla-ood-Deen Beiram to sue for peace. The terms were not settled, when information arrived, that Nasir-ood-Deen had been compelled by Nizam-ool-Moolk Jooneidy to attempt to cross the river, in which he was drowned; after which, the whole country submitted to Altmish.