The Battle of Hanshui (汉水之战) was fought in 219 CE on the banks of the Han River (汉水), near Hanzhong (汉中), during the final stages of Liu Bei’s Hanzhong Campaign against Cao Cao. It is best known for Zhao Yun’s use of an empty-fort stratagem and his subsequent counter-attack, which routed a Wei advance force and secured Liu Bei’s newly won territory.
Context
The Hanzhong Campaign had begun in 217 when Liu Bei launched an invasion of Hanzhong, a strategically vital region that controlled the northern approaches to Yi Province (益州). Hanzhong was held by Cao Cao’s forces under Xiahou Yuan and later Zhang He.
In early 219, Liu Bei’s general Huang Zhong killed Xiahou Yuan at the Battle of Dingjun Mountain, a devastating blow to Cao Cao’s position. Cao Cao arrived in person with reinforcements but was unable to dislodge Liu Bei from his fortified positions. After months of stalemate and mounting casualties — including many desertions — Cao Cao decided to withdraw from Hanzhong. The region fell to Liu Bei.
The battle
As Cao Cao withdrew, the fighting was not yet over. Liu Bei sent Zhao Yun (赵云, courtesy name Zilong 子龙) with a detachment to pursue and harass the retreating Wei forces. Zhao Yun established a camp near the Han River.
Cao Cao sent a large advance force to attack Zhao Yun’s camp. Zhao Yun was outnumbered.
The empty-fort stratagem
Facing a much larger enemy, Zhao Yun made a bold decision. Rather than fortify his camp and prepare for a siege, he ordered the camp gates thrown open, withdrew his troops from view, and silenced the drums. The camp appeared empty and undefended.
The Wei vanguard, approaching the camp, saw the open gates and apparent emptiness. They suspected an ambush — surely no commander would leave his camp so exposed unless troops were hidden inside. They halted their advance and began to withdraw.
The counter-attack
The moment the Wei forces began to retreat, Zhao Yun ordered the drums to be beaten and the war horns to sound. Archers fired from the ramparts. Zhao Yun led his troops out of the camp and pursued the retreating Wei force. The sudden assault threw the Wei vanguard into panic. Many soldiers were killed; many more drowned in the Han River as they fled.
The next morning, Liu Bei arrived at the battlefield and surveyed the scene. He was deeply impressed by Zhao Yun’s conduct and is recorded as saying: “Zilong is full of courage” (子龍一身都是膽也). The soldiers in Liu Bei’s army began to call Zhao Yun “the General of Courage” (虎威將軍).
Historical sources
The battle is recorded in Zhao Yun’s biography in the Records of the Three Kingdoms (SGZ), with annotations by Pei Songzhi that cite the Yun Biezhuan (雲別傳, “Separate Biography of Yun”):
“When Cao Cao’s army approached, Zilong had the camp gates thrown open, silenced the drums, and hid his troops. The enemy suspected an ambush and withdrew. Zilong then sounded the drums and had archers fire; he led a charge and the enemy was thrown into chaos. Many fell into the Han River and drowned. The next morning, the Former Lord [Liu Bei] inspected the camp and said: ‘Zilong is full of courage.’”
Significance
The Battle of Hanshui was a relatively small engagement in the context of the Hanzhong Campaign, but its significance lies in:
- Zhao Yun’s reputation: The battle cemented Zhao Yun’s reputation as one of Shu Han’s most capable and courageous generals. Liu Bei’s praise became one of the most famous compliments in Chinese military literature.
- The empty-fort stratagem: This episode is one of the earliest recorded uses of the “empty fort” (空城計) tactic in Chinese military history. A similar stratagem is later attributed to Zhuge Liang during the Northern Expeditions, though the historical basis for Zhuge Liang’s version is weaker.
- Securing Hanzhong: The victory helped ensure that Cao Cao’s withdrawal from Hanzhong was complete and that Liu Bei could consolidate his control of the region.
Aftermath
Liu Bei declared himself King of Hanzhong (漢中王) later in 219, marking the height of his power. Hanzhong provided a secure northern frontier for Yi Province and served as a launching point for future campaigns against Cao Wei.
Zhao Yun’s conduct at Hanshui became a model of cool-headed tactical leadership under pressure. The episode has been retelled in drama, fiction, and popular culture for nearly two millennia.