Han Dang participated in various battles and campaigns during his service under Sun Quan. In the winter of 208–209, he fought against Cao Cao's forces under the command of Zhou Yu at the Battle of Red Cliffs. In 219, he joined Lü Meng in the successful invasion of Jing Province, which resulted in Sun Quan seizing all territories in the province which used to be under Liu Bei's control. Han Dang was promoted to Lieutenant-General () and appointed as the Administrator () of Yongchang Commandery (). Between 221 and 222, Liu Bei launched a campaign against Sun Quan to retake Jing Province, leading to the Battle of Xiaoting. Han Dang fought in the battle and he, together with Lu Xun, Zhu Ran and others, scored a major victory over Liu Bei. For his contributions, Han Dang was further promoted to General of Vehement Might () and received the title of a Marquis of a Chief Village (). In 223, Han Dang participated in the Battle of Jiangling and resisted the Wei forces led by Cao Zhen.