Relying on the various nationalities in the Western Regions, he united all the people and maintained the unity of the empire. In 90, Ban Chao detained an envoy from Kushan who requested a marriage for his king. In retaliation, the Kushan marched on Ban Chao with a force of 70,000 under commander Xie, and besieged the city of Shule for about ten days.
To maintain unity within his empire, he leveraged the various ethnicities present in the Western Regions.  However, this effort was met with resistance when the Kushan Empire sent an envoy seeking a marriage alliance for their king. In retaliation, the Kushan launched a military campaign against Ban Chao, besieging Shule city for ten days.