Battle of Fancheng
In late 219, Lü Meng, a general serving under Sun Quan, led an army to invade Liu Bei's territories in southern Jing Province. Guan Yu, Liu Bei's general in charge of guarding Jing Province, was away at the Battle of Fancheng and did not know about the invasion until after he returned from his Pyrrhic victory at Fancheng. He was surrounded by Sun Quan's forces in Maicheng (麥城; in Dangyang, Hubei), captured in an ambush while trying to break out of the siege, and eventually executed by Sun Quan's forces in Linju (臨沮; present-day Nanzhang County, Hubei).