 Yang Pu (楊僕) and Xun Zhi (荀彘) respectively—set out from the Han empire to invade Gojoseon.Yang Pu's army of 50,000 sailed from Qi (present-day Shandong Province) across the Bohai Sea towards Gojoseon, while Xun Zhi marched by land through Liaodong and headed towards Wanggeom, the capital of Gojoseon.One of Yang's commanders by the name of Duo took command of a large number of troops and lead them ahead as a vanguard force.