Xu Dan

Biography & Historical Record

Xu Dan was a military general hailing from Danyang Commandery (Danyang Jun) during the late Eastern Han dynasty. Celebrated throughout China as the homeland of the fierce Danyang warriors (Danyang Bing), Danyang was renowned for producing tough, disciplined, and courageous shock infantrymen. Serving under Liu Bei in Xu Province as a General of the Household (Zhonglang Jiang), Xu Dan was entrusted with the direct command of a core elite division consisting of 1,000 Danyang soldiers garrisoning the strategic West Gate of Xiapi, the capital city of Xu Province.

In 196 AD, a major internal crisis erupted in Xu Province. While Liu Bei led his main army south to confront the invading forces of Yuan Shu at Xuyi and Huaiyin, he left Zhang Fei in charge of guarding Xiapi. Zhang Fei’s severe temperament led to a bitter, violent confrontation with Tao Bao, a senior officer originally from Danyang and former subordinate of Tao Qian. Zhang Fei executed Tao Bao, triggering widespread outrage and panic among the Danyang troops stationed inside the city.

Exploiting the chaotic mutiny, Xu Dan decided to betray Liu Bei. He dispatched his trusted subordinate Zhang Guang on a swift horse to deliver an urgent, secret message to the warlord Lu Bu, who was stationed nearby at Xiapi’s perimeter: ‘Zhang Fei has created chaos and slain Tao Bao, throwing the city into total turmoil. Our 1,000 Danyang troops guarding the West Ba Gate jumped for joy as if returned to life upon hearing of your approach. Pray march here immediately, and we shall open the gates to welcome your army!’

Upon receiving Xu Dan’s message, Lu Bu ordered an immediate forced march through the night, arriving at Xiapi by dawn. Xu Dan and his Danyang garrison threw open the West Gate, allowing Lu Bu’s cavalry to flood into the city. Taken completely by surprise amidst the internal revolt, Zhang Fei was forced to flee in chaos, abandoning Liu Bei’s entire family and administrative base. Through Xu Dan’s crucial betrayal, Lu Bu captured Xiapi and seized control of Xu Province. Following this pivotal victory, Xu Dan continued serving under Lu Bu’s warlord regime. However, after Cao Cao besieged, defeated, and executed Lu Bu at White Melon Tower in 199 AD, Xu Dan disappears entirely from historical records.

Role in Romance of the Three Kingdoms

In Luo Guanzhong’s Romance of the Three Kingdoms, Xu Dan’s pivotal role is depicted in Chapter 14 during Lu Bu’s surprise takeover of Xu Province. Commanding the Danyang garrison at the West Gate of Xiapi, Xu Dan aligns with Tao Bao against Zhang Fei’s tyrannical drunkenness and hostility toward local officers. When Zhang Fei kills Tao Bao, Xu Dan collaborates with Lu Bu by dispatching messengers to invite his army into Xiapi. Xu Dan opens the city gates at dawn, enabling Lu Bu to rout Zhang Fei and capture Liu Bei’s headquarters and family in a swift night strike.

Xu Dan (許耽) — Literary Timeline

For detailed historical records, archives, and official chronicles, explore Xu Dan on Wikipedia.

Key Relationships

Family

• No information

Friends

• Cao Bao (曹豹, Tào Báo): A senior Danyang officer and comrade-in-arms; his execution by Zhang Fei in 196 AD served as the primary catalyst for Xu Dan’s mutiny.
• Zhang Guang (张广, Trương Quảng): A trusted subordinate officer whom Xu Dan dispatched to communicate with Lu Bu during the betrayal of Xiapi in 196 AD.

Enemies

• Zhang Fei (张飞, Trương Phi): A general under Liu Bei whose volatile temperament and killing of Cao Bao in 196 AD provoked Xu Dan to defect and open the city gates.
• Liu Bei (刘备, Lưu Bị): The warlord whom Xu Dan served as a General of the Household until betraying him to hand over the capital of Xiapi to Lu Bu in 196 AD.
• Cao Cao (曹操, Tào Tháo): The warlord whose forces besieged and destroyed the regime of Lu Bu at the Battle of Xiapi in 199 AD, effectively ending Xu Dan’s career.

Other

• Lu Bu (吕布, Lữ Bố): The warlord whom Xu Dan invited to seize Xiapi in 196 AD; Xu Dan subsequently served under his command until the fall of the regime in 199 AD.