While later serving as the military governor (Jiedushi) of Xichuan Circuit (西川, headquartered in modern Chengdu), he was further blamed for failure of discipline that caused his soldiers to provoke a major Nanzhao invasion against Xichuan, leading to his exile.
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Over the years, because of Du's mistreatment of the soldiers, the soldiers, lacking food and clothing, were forced to pillage the borders of Nanzhao in order to have sufficient supplies.
Kingdom of Nanzhao (南詔), polity that flourished in southern China and Southeast Asia during the 8th and 9th centuries
British Clergy David proposed that the Kingdom of Nanzhao was founded by Thai, who fled to the south as a result of Mongolian Invasion in mid-14th century.
It extends Line 4 south from its southern terminus at Majialou, on the 4th Ring Road in Fengtai District, to Nanzhao Lu, beyond the 6th Ring Road in Daxing District.
870 at Halin, the Pyu city reportedly destroyed by an 832 Nanzhao raid.
In 832, Nanzhao destroyed the city-state of Halin, close to old Tagaung, returning again in 835 to carry off many captives.