The Chachnāma (Fatḥnāma-yi Sind) 80: Orders are received from Hajjaj son of Yusuf to cross the Mihran, and a battle is fought with Dahir.

80

When Muhammad Kasim had fixed the several tributes of those chiefs, he gave them fresh written agreements for their satisfaction. He appointed there Hamid, son of Wida'u-n Najdi and 'Abdu-l Kais, of the family of Jarud, and as they were confidential persons he entrusted to them all the business of that place.
When he had settled the affairs of Sisam, he received orders from Hajjaj to proceed to some other place; to return to Nirun, take measures to cross the Mihran, and fight with Dahir. He was directed to ask Almighty God for assistance in obtaining success and conquest; and after having obtained the objects of his expedition, he was to strengthen all the forts and places throughout the country, and leave none in an unprovided state. When Muhammad Kasim read the farman, and understood its contents, he came to Nirun and transmitted his despatches.