The Battle of Yecheng (204) 

This video will explore The Battle of Ye fought between Cao Cao, Yuan Shang & Yuan Tan
Sources
Chen Shou and Pei Songzhi, Annotated Records of the Three Kingdoms
de Crespigny, Rafe (1996). To establish peace : being the chronicle of Later Han for the years 189 to 220 AD
de Crespigny, Rafe (2010). Imperial warlord : a biography of Cao Cao 155-220 AD