An existing road in Sichuan – the "Five Foot Way" – was extended south to around present day Qujing, in eastern Yunnan. In 109 BC, the Han dynasty invaded Dian during its southern expeditions. Under orders from Emperor Wu, General Guo Chang [zh] (郭昌) was sent south to Yunnan, eventually establishing the Yizhou commandery.[19] By this time, agricultural technology in Yunnan had improved markedly.