 In spring 757, Wang sent Dong with an army over the Bohai Sea, on simple rafts, to join the general Tian Shen'gong () to attack Pingyuan (平原, roughly modern Dezhou, Shandong) and Le'an (樂安, roughly modern Binzhou, Shandong) Commanderies, recapturing them from Yan forces.The Tang general in overall command in the area, Li Xian (), exercising imperial authority, made Dong the governor of Pingyuan Commandery.