In 911, the Samanid ruler Ahmad Samani, ordered an invasion of Saffarid Sistan; Simjur along with other Samanid generals quickly subdued parts of Sistan and then captured its capital, Zarang from the Saffarid ruler Al-Mu'addal.
During the conquest of Sistan, a Caliphal rebel of Turkic origin named Sebük-eri, was captured and sent to the Abbasid caliph in Baghdad, while Abu Salih Mansur, the cousin of Ahmad Samani, was appointed as governor of Sistan.
Mansur was then taken prisoner until the rebellion was crushed by an Samanid army under Husain ibn 'Ali Marvarrudhi in 913.
During the reign of Ahmad's son Nasr II, the Zaydids invaded Greater Khorasan, but were repulsed by Simjur.
[1] He died at an unknown date during the reign of Nasr II and had a son named Ibrahim ibn Simjur.