Fana-Khusrau attempted to recreate his father's state in central Iran, which had been overrun by the Ghaznavids in 1029.
The Tahirids were in turn replaced in Merv by the first the Saffarids, then the Samanids and later the Ghaznavids.
They then went on to conquer Hansi, Thaneshvar, Nagarkot and other cities taken by the Ghaznavids and marched against Lahore and besieged it.
He defaulted upon the payments, imprisoned Sebuktigin's collectors, and assembled a more larger army of 100,000 horse and an innumerable host of foot, allied with forces from the kingdoms of Delhi, Ajmer, Kalinjar, and Kannauj, which was defeated in battle with Sebuktigin's Ghaznavids at the banks of the Neelum River in Kashmir.