Zhao Tuo died in 137 BC and was succeeded by his grandson, Zhao Mo. Upon Zhao Mo's accession in 137 BC, the neighboring king of Minyue, Zou Ying, sent his army to attack Nanyue. Zhao sent for help from the Han dynasty, his nominal vassal overlord. The Han responded by sending troops against Minyue, but before they could get there, Zou Ying was killed by his brother Zou Yushan, who surrendered to the Han. The Han army was recalled. Zhao considered visiting the Han court in order to show his gratitude. His high ministers argued against it, reminding him that his father kept his distance from the Han and merely avoided a breach of etiquette to keep the peace. Zhao therefore pleaded illness and never went through with the trip. Zhao did actually fall ill several years later and died in 122 BC. He was succeeded by his son, Zhao Yingqi.