Dong Ping was from Shangdang, Hedong. He served in Dongpingfu as a defending general. Besides, being skilful with his double spears in combat, he was also a man of romance, music and other arts.
When Song Jiang attacked Dongpingfu, he sent Yu Bao-si and Wang Ding-liu as envoys to hand the declaration of war to the governor. The governor was shaken, but Dong Ping calmed him down and suggested killing the envoys. In the end, the governor chased the envoys out after having them severely beaten up.
Shi Jin had a good relationship with Li Ruilan, a prostitute in Dongpingfu, and he volunteered to sneak inside the city and act as a conspirator. Unfortunately, the pimp reported Shi Jin to the county office and Shi was arrested. Song Jiang immediately selected his troops for an offensive on Dongpingfu.