Despite this, when Shams ud-Din invaded again and attacked Shahr-i Sistan in October 1263, several groups hostile to Nasr al-Din supported the Kartid.
A joint Ilkhanid–Kartid force battled with and defeated the Jochids; Junjudar fled to Shahr-i Sistan and received refuge from Nasir al-Din.
During this time he was also active in fighting the raids of Qaraunas (also known as Neguderis)[1] bands who aligned with the Chagatayids and had to put down a rebellion staged by his chamberlain.
Having secured control of Sistan and ensured its defense against external forces, Nasir al-Din was free to pursue a relatively independent foreign policy.
Shams al-Din soon ran into problems maintaining his hold over Quhistan, but was helped by military assistance from his father.
In 1318 Nasir al-Din found himself threatened by the Chagatayid commander Yasa'ur, who had been granted the region around Badghis by Öljaitü Khan.
Yasa'ur invaded Sistan after having refused Nasir al-Din's offers of tribute, but became worried when a Neguderi band threatened his rear.
Eight months of fighting in the capital failed to establish a clear winner and caused a significant amount of damage to the city, so the religious leaders of Sistan stepped in and decided on a division of power.