After Qin Shi Huang conquered the six other Chinese kingdoms of Han, Zhao, Wei, Chu, Yan, and Qi, he turned his attention to the Xiongnu tribes of the north and west and the Hundred Yue peoples of what is now southern China. As trade was an important source of wealth for the Baiyue peoples of coastal southern China, the region south of the Yangtze River attracted the attention of Emperor Qin Shi Huang. Lured by its temperate climate, fertile fields, maritime trade routes, relative security from warring factions to the west and northwest, and access to luxury tropical products from Southeast Asia, the emperor sent armies to conquer the Yue kingdoms in 221 BCE.^[31] Around 218 BCE, the First Emperor dispatched General Tu Sui with an army of 500,000 Qin soldiers to divide into five companies and attack the Hundred Yue tribes of the Lingnan region. Military expeditions against the region were dispatched between 221 and 214 BCE.^[32] It would take five successive military excursions before the Qin finally defeated the Yue in 214 BCE.^[33]