Firishta's History (Gulshan-i Ibrāhīmī) 6.1.6

6.1.6

The Emperor, instead of replying to the letter of Mahmood, contrived to gain over his ambassador to his own service, and appointed him to the office of Vizier. Mahmood accordingly marched to recover Nyshapoor from Toozun Beg, who, advised of his intention, abandoned the city, and sending intelligence of his situation to the Emperor Ameer Munsoor, that prince himself marched to oppose Mahmood, and in the rashness of inexperienced youth hastened towards Khorassan, without halting, till he reached Surukhsh. Mahmood, though he well knew that the Emperor was in no condition to oppose him, was induced, out of respect towards the imperial standards of Samany, to evacuate Nyshapoor, and to fall back on Moorghab. Ameer Toozun Beg, in the mean time, treacherously engaged in a conspiracy with Faik in the camp of Ameer Munsoor, and seizing that prince, put out his eyes, and raised Abdool-Mullik, the younger brother of Munsoor (then a boy), to the throne. Apprehensive, however, of the resentment of Mahmood, the conspirators hastened to Murv, whither they were pursued by Mahmood. Finding themselves hard pressed, they halted and gave battle, but were defeated. Faik carried off the young king, and fled to Bokhara; Toozun Beg also escaped, but was not heard of, till he began to collect his scattered troops. Faik, in the mean time, fell sick, and soon after died.